java - 从 jtextfield 获取数据并将其反转以显示在另一个 jtextfield 中

Question

我不确定之前是否已经回答过这个问题；我尝试搜索看看是否有，但没有成功。

我正在做一项家庭作业，并且必须有两个 JTextField:一个接受输入，第二个反转显示给定的输入。例如，如果有人输入 12345，则输出应为 54321，或者如果输入 Hello，则输出应为 olleH。

我已经尝试了一切我能做的事情，但并不算太多。任何帮助或正确方向的观点都会很好。这是我的代码:

//Importing the packages for the program.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import static jdk.nashorn.internal.objects.NativeArray.reverse;


public class Gui extends JFrame {

    private JLabel Normtxt, Revertxt;
    private JTextField NormInput, ReverOutput;
    private JButton Reverse, ClearFields;
    private string Text;

public Gui(){

    super("Reverse Your Input");
    setLayout(new FlowLayout());

    Normtxt = new JLabel("Enter a String to Reverse:");
    NormInput = new JTextField(" ",20);
    Revertxt = new JLabel("Here is Your String Reversed:");
    ReverOutput = new JTextField(" ",20);
    Reverse = new JButton("Reverse");
    ClearFields = new JButton("Clear");

    add(Normtxt);
    add(NormInput);
    add(Revertxt);
    add(ReverOutput);
    add(Reverse);
    add(ClearFields);

    NormInput.requestFocus();

    ReverseClass ReverseDigit = new ReverseClass();
    Reverse.addActionListener(ReverseDigit);

    //ClearClass Clear = new ClearClass();
    //ClearFields.addActionListener(Clear);

}
private class ReverseClass implements ActionListener{
    public void actionPerformed(ActionEvent event){

        StringBuilder sb = new StringBuilder(sb.reverse().toString());
        NormInput.getText();
        sb.reverse(NormInput); 
        Revertxt.setText(sb.reverse(NormInput).toString());


    }

}    
private class ClearClass implements ActionListener{
    public void actionPerformed(ActionEvent event){

        NormInput.setText("");
        Revertxt.setText("");
        NormInput.requestFocus();
    }
}
}``

Answer 1

使用

StringBuilder builder = new StringBuilder();
builder.append(NormInput.getText().trim());
Revertxt.setText(builder.reverse());

在您的代码中将类 ReverseClass 替换为以下

private class ReverseClass implements ActionListener{
    public void actionPerformed(ActionEvent event){
        StringBuilder builder = new StringBuilder();
        builder.append(NormInput.getText().trim());
        Revertxt.setText(builder.reverse().toString());
    }

}

这会有所帮助。