JAVA:在 Jframe GUI 中将用户输入保存为字符串

Question

新人在这里。我已经浏览了几个小时，但我仍然无法找出将用户输入保存为 Jframe 文本字段中的字符串的正确方法。任何帮助，将不胜感激。我想将用户的文本保存到变量 userWords 中。

package cipher;
import java.util.*;
import java.io.*;
import javax.swing.*;
import java.awt.*;

public class cipherApp extends JFrame {


    private static final int WIDTH = 700;
    private static final int HEIGHT = 700;      

    private String userWords; // stores user input into a string

    public cipherApp(){
        setTitle("Camo Cipher");
        setSize(WIDTH, HEIGHT);
        setVisible(true);
        setDefaultCloseOperation(EXIT_ON_CLOSE);    

    }   
    public static void main(String[] args){
        cipherApp newInstance = new cipherApp();

    }
}

Answer 1

您必须使用 JTextField 和 JButton 来提交使用输入:

public class Test extends JFrame {

    String userWord = "";
    JTextField userInput = new JTextField(10);
    JButton submit = new JButton("Submit");

    public Test() {
        super("Camo Cipher");
        JPanel centerPanel = new JPanel(new FlowLayout(FlowLayout.CENTER, 15, 15));
        setSize(WIDTH, HEIGHT);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setLocationRelativeTo(null); // This center the window on the screen
        submit.addActionListener( (e)-> {
            submitAction();
        });
        centerPanel.add(userInput);
        JPanel southPanel = new JPanel(new FlowLayout(FlowLayout.CENTER, 15, 15));
        southPanel.add(submit);
        Box theBox = Box.createVerticalBox();
        theBox.add(Box.createVerticalStrut(100));
        theBox.add(centerPanel);
        theBox.add(Box.createVerticalStrut(200));
        theBox.add(southPanel);
        add(theBox);
    }

    private void submitAction() {
        // You can do some validation here before assign the text to the variable 
        userWord = userInput.getText();
    }

    public static void main(String[] args) {
        new Test().setVisible(true);
    }
}