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我是 Android 开发新手,在玩 Hang-Man 游戏时遇到了一些问题。
这就是我希望它工作的方式:1. 当应用程序启动时,数据库被打开 (db.open()) 并从数据库中获取一个随机词 (db.random()) 并放入生成的字符串中。然后将generatedWord做成Spannablestring文本(SpannableString text = new SpannableString(generatedWord);),整个文本做成颜色白色/不可见。
当用户在 TextView userInput 中输入一个字符时,我想使用 onKeyListener 将其保存到可用的 lastInput 中:lastInput = (char)event.getUnicodeChar();
然后当按下 Enter 按钮时,应调用 guess() 并向 lastInput 发送一个参数。在那里它检查 lastInput 是否在 indexOf generatedWord 中,如果是,它将使字符的文本再次变黑并可见,如果不是,它应该调用 showImages() 从而使图像可见。
事情就是这样!数据库正在运行,我只是让应用程序与 gui 和所有东西一起运行,然后我做了一些小改动,现在我无法再次启动该应用程序,只会出现 fatal error 。我做错了什么,我能想到什么?
非常感谢
//主要 Activity
package com.emanuelolsson.simplehangman;
import database.DBAdapter;
import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.text.SpannableString;
import android.text.style.ForegroundColorSpan;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
public class HangMan extends Activity {
// DECLARE NEEDED VARIABLES
private String generatedWord = "";
private char lastInput = '\0';
private Button newGameButton, enterLetterButton;
private EditText wordHolder, userInput;
private ImageView imageOne, imageTwo, imageThree, imageFour, imageFive, imageSix, imageSeven, imageEight, winner, hanged;
private SpannableString text = new SpannableString(generatedWord);
private int count = 0;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_hang_man);
DBAdapter db = new DBAdapter(this);
// ASSIGN OBJECTS
newGameButton = (Button) findViewById(R.id.newGame);
enterLetterButton = (Button) findViewById(R.id.enter);
wordHolder = (EditText) findViewById(R.id.wordHolder);
userInput = (EditText) findViewById(R.id.userInput);
imageOne = (ImageView) findViewById(R.id.imageView1);
imageTwo = (ImageView) findViewById(R.id.imageView2);
imageThree = (ImageView) findViewById(R.id.imageView3);
imageFour = (ImageView) findViewById(R.id.imageView4);
imageFive = (ImageView) findViewById(R.id.imageView5);
imageSix = (ImageView) findViewById(R.id.imageView6);
imageSeven = (ImageView) findViewById(R.id.imageView7);
imageEight = (ImageView) findViewById(R.id.imageView8);
winner = (ImageView) findViewById(R.id.winner);
hanged = (ImageView) findViewById(R.id.hanged);
imageOne.setVisibility(View.INVISIBLE);
imageTwo.setVisibility(View.INVISIBLE);
imageThree.setVisibility(View.INVISIBLE);
imageFour.setVisibility(View.INVISIBLE);
imageFive.setVisibility(View.INVISIBLE);
imageSix.setVisibility(View.INVISIBLE);
imageSeven.setVisibility(View.INVISIBLE);
imageEight.setVisibility(View.INVISIBLE);
winner.setVisibility(View.INVISIBLE);
hanged.setVisibility(View.INVISIBLE);
// ADD LISTENERS
newGameButton.setOnClickListener(new OnClickListener(){
public void onClick(View arg0) {
}
});
enterLetterButton.setOnClickListener(new OnClickListener(){
public void onClick(View arg0) {
guess(lastInput);
}
});
userInput.setOnKeyListener(new View.OnKeyListener(){
@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
lastInput = (char)event.getUnicodeChar();
return false;
}
});
db.open();
db.randomize(generatedWord);
SpannableString text = new SpannableString(generatedWord);
text.setSpan(new ForegroundColorSpan(Color.WHITE), 0, text.length(), 0);
wordHolder.setText(text);
db.close();
}
// What happens when user clicks Enter
// If the guess (char) is in the index of generated word and not -1 it will span back hopefully to all char
public void guess(char guess) {
guess = Character.toUpperCase(guess);
if (generatedWord.indexOf(lastInput) != -1) {
text.setSpan(new ForegroundColorSpan(Color.BLACK), text.charAt(lastInput), text.charAt(lastInput), 0);
//guessedChars.add(guess);
} else {
showImages();
}
}
private void showImages() {
count ++;
if (count == 1)
{
imageOne.setVisibility(View.INVISIBLE);
}
else if (count == 2)
{
imageTwo.setVisibility(View.INVISIBLE);
}
else if (count == 3)
{
imageThree.setVisibility(View.INVISIBLE);
}
else if (count == 4)
{
imageFour.setVisibility(View.INVISIBLE);
}
else if (count == 5)
{
imageFive.setVisibility(View.INVISIBLE);
}
else if (count == 6)
{
imageSix.setVisibility(View.INVISIBLE);
}
else if (count == 7)
{
imageSeven.setVisibility(View.INVISIBLE);
}
else if (count == 8)
{
gameEnd();
}
}
private void gameEnd() {
if (count == 8)
{
hanged.setVisibility(View.VISIBLE);
}
else
{
winner.setVisibility(View.VISIBLE);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_hang_man, menu);
return true;
}
}
//数据库适配器
package database;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
public class DBAdapter
{
public static final String KEY_ROWID = "_id";
public static final String KEY_WORDS = "words";
private static final String TAG = "DBAdapter";
private static final String DATABASE_NAME = "dbnames";
private static final String DATABASE_TABLE = "tblnames";
private static final int DATABASE_VERSION = 1;
private static final String DATABASE_CREATE =
"create table tblnames (_id integer primary key autoincrement, "
+ "words text not null);";
private final Context context;
private DatabaseHelper DBHelper;
private SQLiteDatabase db;
public DBAdapter(Context ctx)
{
this.context = ctx;
DBHelper = new DatabaseHelper(context);
}
private static class DatabaseHelper extends SQLiteOpenHelper
{
DatabaseHelper(Context context)
{
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db)
{
db.execSQL(DATABASE_CREATE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion,
int newVersion)
{
Log.w(TAG, "Upgrading database from version " + oldVersion
+ " to "
+ newVersion + ", which will destroy all old data");
db.execSQL("DROP TABLE IF EXISTS tblnames");
onCreate(db);
}
}
// Open DB
public DBAdapter open() throws SQLException
{
db = DBHelper.getWritableDatabase();
return this;
}
// Close DB
public void close()
{
DBHelper.close();
}
// INsert name
public long insertWord(String word)
{
ContentValues initialValues = new ContentValues();
initialValues.put(KEY_WORDS, word);
return db.insert(DATABASE_TABLE, null, initialValues);
}
// Delete a name
public boolean deleteWord(long rowId)
{
return db.delete(DATABASE_TABLE, KEY_ROWID +
"=" + rowId, null) > 0;
}
// Get all names
public Cursor getAllWords()
{
return db.query(DATABASE_TABLE, new String[] {
KEY_ROWID,
KEY_WORDS},
null,
null,
null,
null,
null);
}
// Get a certain name
public Cursor getWord(long rowId) throws SQLException
{
Cursor mCursor =
db.query(true, DATABASE_TABLE, new String[] {
KEY_ROWID,
KEY_WORDS},
KEY_ROWID + "=" + rowId,
null,
null,
null,
null,
null);
if (mCursor != null) {
mCursor.moveToFirst();
}
return mCursor;
}
// Update name
public boolean updateWord(long rowId, String word)
{
ContentValues args = new ContentValues();
args.put(KEY_WORDS, word);
return db.update(DATABASE_TABLE, args,
KEY_ROWID + "=" + rowId, null) > 0;
}
// Clears DB
public void clear() {
db.delete(DATABASE_TABLE, "1", null);
}
public void randomize(String word) {
@SuppressWarnings("unused")
Cursor cursor;
cursor = this.db.query("tblnames ORDER BY RANDOM() LIMIT 1", new String[] { "*" }, null, null, null, null, null);
}
}
//布局
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ImageView
android:id="@+id/imageView1"
android:layout_width="150dp"
android:layout_height="150dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="43dp"
android:src="@drawable/one"
android:contentDescription="@string/picOne" />
<ImageView
android:id="@+id/imageView2"
android:layout_width="150dp"
android:layout_height="150dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="43dp"
android:src="@drawable/two"
android:contentDescription="@string/picTwo" />
<ImageView
android:id="@+id/imageView3"
android:layout_width="150dp"
android:layout_height="150dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="43dp"
android:contentDescription="@string/picThree"
android:src="@drawable/three" />
<ImageView
android:id="@+id/imageView4"
android:layout_width="150dp"
android:layout_height="150dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="43dp"
android:src="@drawable/four"
android:contentDescription="@string/picFour" />
<ImageView
android:id="@+id/imageView5"
android:layout_width="150dp"
android:layout_height="150dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="43dp"
android:src="@drawable/five"
android:contentDescription="@string/picFive" />
<ImageView
android:id="@+id/imageView6"
android:layout_width="150dp"
android:layout_height="150dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="43dp"
android:src="@drawable/six"
android:contentDescription="@string/picSix" />
<ImageView
android:id="@+id/imageView7"
android:layout_width="150dp"
android:layout_height="150dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="43dp"
android:src="@drawable/seven"
android:contentDescription="@string/picSeven" />
<ImageView
android:id="@+id/imageView8"
android:layout_width="150dp"
android:layout_height="150dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="43dp"
android:src="@drawable/eight"
android:contentDescription="@string/picEight" />
<EditText
android:id="@+id/wordHolder"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:ems="10"
android:inputType="text" >
<requestFocus />
</EditText>
<Button
android:id="@+id/enter"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/imageView1"
android:layout_below="@+id/wordHolder"
android:layout_marginTop="28dp"
android:text="@string/enter" />
<EditText
android:id="@+id/userInput"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/enter"
android:layout_alignLeft="@+id/wordHolder"
android:layout_alignTop="@+id/enter"
android:layout_toLeftOf="@+id/enter"
android:ems="10"
android:inputType="text" />
<ImageView
android:id="@+id/winner"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="@+id/imageView1"
android:layout_centerHorizontal="true"
android:src="@drawable/winner"
android:contentDescription="@string/winner" />
<ImageView
android:id="@+id/hanged"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="@+id/imageView1"
android:layout_centerHorizontal="true"
android:src="@drawable/hanged"
android:contentDescription="@string/hanged" />
<Button
android:id="@+id/newGame"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/enter"
android:layout_alignBottom="@+id/enter"
android:layout_toRightOf="@+id/enter"
android:text="@string/newGame" />
</RelativeLayout>
最佳答案
解决方案:再次检查 guess 是否显示正确的字母猜测,从 _ 到适当的字母。
//主 Activity .java
package com.emanuelolsson.simplehangman;
import database.DBAdapter;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
public class HangMan extends Activity {
// DECLARE NEEDED VARIABLES
private Button newGameButton, enterLetterButton;
private EditText userInput;
private TextView wordHolder;
private ImageView imageOne, imageTwo, imageThree, imageFour, imageFive, imageSix, imageSeven, imageEight, winner, hanged;
private String hiddenWord, randomedWord;
private int count = 0;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_hang_man);
DBAdapter db = new DBAdapter(this);
// ASSIGN OBJECTS
newGameButton = (Button) findViewById(R.id.newGame);
enterLetterButton = (Button) findViewById(R.id.enter);
wordHolder = (TextView) findViewById(R.id.wordHolder);
userInput = (EditText) findViewById(R.id.userInput);
imageOne = (ImageView) findViewById(R.id.imageView1);
imageTwo = (ImageView) findViewById(R.id.imageView2);
imageThree = (ImageView) findViewById(R.id.imageView3);
imageFour = (ImageView) findViewById(R.id.imageView4);
imageFive = (ImageView) findViewById(R.id.imageView5);
imageSix = (ImageView) findViewById(R.id.imageView6);
imageSeven = (ImageView) findViewById(R.id.imageView7);
imageEight = (ImageView) findViewById(R.id.imageView8);
winner = (ImageView) findViewById(R.id.winner);
hanged = (ImageView) findViewById(R.id.hanged);
imageOne.setVisibility(View.INVISIBLE);
imageTwo.setVisibility(View.INVISIBLE);
imageThree.setVisibility(View.INVISIBLE);
imageFour.setVisibility(View.INVISIBLE);
imageFive.setVisibility(View.INVISIBLE);
imageSix.setVisibility(View.INVISIBLE);
imageSeven.setVisibility(View.INVISIBLE);
imageEight.setVisibility(View.INVISIBLE);
winner.setVisibility(View.INVISIBLE);
hanged.setVisibility(View.INVISIBLE);
wordHolder.setVisibility(View.VISIBLE);
// ADD LISTENERS
newGameButton.setOnClickListener(new OnClickListener(){
public void onClick(View arg0) {
newGame();
}
});
enterLetterButton.setOnClickListener(new OnClickListener(){
public void onClick(View arg0) {
if (!(userInput.getText().toString().isEmpty()) )
{
guess();
} else if (userInput.getText().toString().isEmpty())
{
Toast toast = Toast.makeText(getApplicationContext(), "You need to insert a letter", Toast.LENGTH_SHORT);
toast.show();
}
}
});
db.open();
db.fill();
randomedWord = db.randomize();
invWord();
wordHolder.setText(hiddenWord);
db.clear();
db.close();
}
public void newGame() {
DBAdapter db = new DBAdapter(this);
count = 0;
imageOne.setVisibility(View.INVISIBLE);
imageTwo.setVisibility(View.INVISIBLE);
imageThree.setVisibility(View.INVISIBLE);
imageFour.setVisibility(View.INVISIBLE);
imageFive.setVisibility(View.INVISIBLE);
imageSix.setVisibility(View.INVISIBLE);
imageSeven.setVisibility(View.INVISIBLE);
imageEight.setVisibility(View.INVISIBLE);
winner.setVisibility(View.INVISIBLE);
hanged.setVisibility(View.INVISIBLE);
db.open();
db.fill();
randomedWord = db.randomize();
invWord();
wordHolder.setText(hiddenWord);
db.clear();
db.close();
}
public void invWord()
{
hiddenWord = randomedWord;
hiddenWord = hiddenWord.replaceAll(".", "_" +" ");
}
public void guess()
{
char guess = userInput.getText().charAt(0);
StringBuilder builder = new StringBuilder(hiddenWord);
String j = ""+guess;
int index = randomedWord.indexOf(guess);
if (randomedWord.contains(j))
{
while (index >= 0)
{
builder.setCharAt(index*2, guess);
index = randomedWord.indexOf(guess, index + 1);
hiddenWord = builder.toString().trim();
wordHolder.setText(hiddenWord);
if (!(hiddenWord.toString().contains("_".toString())) )
{
winner();
}
}
}
else
{
showImages();
}
}
private void winner()
{
imageOne.setVisibility(View.INVISIBLE);
imageTwo.setVisibility(View.INVISIBLE);
imageThree.setVisibility(View.INVISIBLE);
imageFour.setVisibility(View.INVISIBLE);
imageFive.setVisibility(View.INVISIBLE);
imageSix.setVisibility(View.INVISIBLE);
imageSeven.setVisibility(View.INVISIBLE);
imageEight.setVisibility(View.INVISIBLE);
winner.setVisibility(View.VISIBLE);
}
private void showImages() {
count ++;
if (count == 1)
{
imageOne.setVisibility(View.VISIBLE);
}
else if (count == 2)
{
imageTwo.setVisibility(View.VISIBLE);
}
else if (count == 3)
{
imageThree.setVisibility(View.VISIBLE);
}
else if (count == 4)
{
imageFour.setVisibility(View.VISIBLE);
}
else if (count == 5)
{
imageFive.setVisibility(View.VISIBLE);
}
else if (count == 6)
{
imageSix.setVisibility(View.VISIBLE);
}
else if (count == 7)
{
imageSeven.setVisibility(View.VISIBLE);
}
else if (count == 8)
{
gameEnd();
}
}
private void gameEnd()
{
imageOne.setVisibility(View.INVISIBLE);
imageTwo.setVisibility(View.INVISIBLE);
imageThree.setVisibility(View.INVISIBLE);
imageFour.setVisibility(View.INVISIBLE);
imageFive.setVisibility(View.INVISIBLE);
imageSix.setVisibility(View.INVISIBLE);
imageSeven.setVisibility(View.INVISIBLE);
imageEight.setVisibility(View.VISIBLE);
hanged.setVisibility(View.VISIBLE);
wordHolder.setText(randomedWord);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_hang_man, menu);
return true;
}
}
//XML
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ImageView
android:id="@+id/imageView1"
android:layout_width="150dp"
android:layout_height="150dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="43dp"
android:contentDescription="@string/picOne"
android:src="@drawable/one" />
<ImageView
android:id="@+id/imageView2"
android:layout_width="150dp"
android:layout_height="150dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="43dp"
android:contentDescription="@string/picTwo"
android:src="@drawable/two" />
<ImageView
android:id="@+id/imageView3"
android:layout_width="150dp"
android:layout_height="150dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="43dp"
android:contentDescription="@string/picThree"
android:src="@drawable/three" />
<ImageView
android:id="@+id/imageView4"
android:layout_width="150dp"
android:layout_height="150dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="43dp"
android:contentDescription="@string/picFour"
android:src="@drawable/four" />
<ImageView
android:id="@+id/imageView5"
android:layout_width="150dp"
android:layout_height="150dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="43dp"
android:contentDescription="@string/picFive"
android:src="@drawable/five" />
<ImageView
android:id="@+id/imageView6"
android:layout_width="150dp"
android:layout_height="150dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="43dp"
android:contentDescription="@string/picSix"
android:src="@drawable/six" />
<ImageView
android:id="@+id/imageView7"
android:layout_width="150dp"
android:layout_height="150dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="43dp"
android:contentDescription="@string/picSeven"
android:src="@drawable/seven" />
<ImageView
android:id="@+id/imageView8"
android:layout_width="150dp"
android:layout_height="150dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="43dp"
android:contentDescription="@string/picEight"
android:src="@drawable/eight" />
<ImageView
android:id="@+id/winner"
android:layout_width="150dp"
android:layout_height="150dp"
android:layout_alignTop="@+id/imageView1"
android:layout_centerHorizontal="true"
android:contentDescription="@string/winner"
android:src="@drawable/winner" />
<ImageView
android:id="@+id/hanged"
android:layout_width="150dp"
android:layout_height="150dp"
android:layout_alignTop="@+id/imageView1"
android:layout_centerHorizontal="true"
android:contentDescription="@string/hanged"
android:src="@drawable/hanged" />
<TextView
android:id="@+id/wordHolder"
android:layout_width="175dp"
android:layout_height="40dp"
android:layout_centerInParent="true"
android:layout_alignTop="@+id/imageView1"
android:layout_marginTop="134dp"
android:layout_marginLeft="50dp"
android:ems="10"
android:textSize="30dp" />
<Button
android:id="@+id/newGame"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignRight="@+id/wordHolder"
android:layout_centerVertical="true"
android:text="@string/newGame" />
<Button
android:id="@+id/enter"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/newGame"
android:layout_alignBottom="@+id/newGame"
android:layout_toLeftOf="@+id/newGame"
android:text="@string/enter" />
<EditText
android:id="@+id/userInput"
android:layout_width="40dp"
android:layout_height="40dp"
android:layout_alignBaseline="@+id/enter"
android:layout_alignBottom="@+id/enter"
android:layout_toLeftOf="@+id/enter"
android:ems="10"
android:inputType="text"
android:textSize="20dp" >
<requestFocus />
</EditText>
<ImageView
android:id="@+id/imageView9"
android:layout_width="250dp"
android:layout_height="60dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:contentDescription="@+id/header"
android:src="@drawable/header" />
</RelativeLayout>
关于java - 如何从头到尾逐渐显示一个字符串(可见性)?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/12544964/
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If string is an alias of String in the .net framework为什么会发生这种情况,我应该如何解释它: type JustAString = string
我有两个列表(或字符串):一个大,另一个小。 我想检查较大的(A)是否包含小的(B)。 我的期望如下: 案例 1. B 是 A 的子集 A = [1,2,3] B = [1,2] contains(A
我有一个似乎无法解决的小问题。 这里...我有一个像这样创建的输入... var input = $(''); 如果我这样做......一切都很好 $(this).append(input); 如果我
我有以下代码片段 string[] lines = objects.Split(new string[] { "\r\n", "\n" }, StringSplitOptions.No
这可能真的很简单,但我已经坚持了一段时间了。 我正在尝试输出一个字符串,然后输出一个带有两位小数的 double ,后跟另一个字符串,这是我的代码。 System.out.printf("成本:%.2
以下是 Cloud Firestore 列表查询中的示例之一 citiesRef.where("state", ">=", "CA").where("state", "= 字符串,我们在Stack O
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这个问题在这里已经有了答案: How to implement big int in C++ (14 个答案) 关闭 9 年前。 我有 2 个字符串,都只包含数字。这些数字大于 uint64_t 的
我有一个带有自定义转换器的 Dozer 映射: com.xyz.Customer com.xyz.CustomerDAO customerName
这个问题在这里已经有了答案: How do I compare strings in Java? (23 个回答) 关闭 6 年前。 我想了解字符串池的工作原理以及一个字符串等于另一个字符串的规则是
我已阅读 this问题和其他一些问题。但它们与我的问题有些无关 对于 UILabel 如果你不指定 ? 或 ! 你会得到这样的错误: @IBOutlet property has non-option
这两种方法中哪一种在理论上更快,为什么? (指向字符串的指针必须是常量。) destination[count] 和 *destination++ 之间的确切区别是什么? destination[co
This question already has answers here: Closed 11 years ago. Possible Duplicates: Is String.Format a
我有一个Stream一个文件的,现在我想将相同的单词组合成 Map这很重要,这个词在 Stream 中出现的频率. 我知道我必须使用 collect(Collectors.groupingBy(..)
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