GUIボタンを使って異なるJtextFieldsでテキストを書き込む方法guiボタンのフォーカスを異なるJtextFieldに変更するには？

Question

私は、最初のJtextfieldが最初の値を取る、最初のJtextfieldを使用して簡単な電卓を作った。2番目のJtextfieldは2番目の値をとり、3番目のJtextfieldはGUIの+、 - 、*、/

1つ以上のJTextField.howにGUIボタンを使用して値を入力すると、両方のテキストフィールドにテキストを入力するGUIボタンが得られませんか？

import javax.swing.*; 
import javax.swing.border.EmptyBorder; 
import java.awt.*; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 

    public class ui implements ActionListener { 
public JButton btn1; 
public JButton btn2; 
public JButton btn3; 
public JButton btn4; 
public JButton btn5; 
public JButton btn6; 
public JButton btn7; 
public JButton btn8; 
public JButton btn9; 
public JButton btn0; 
public JButton btnAdd; 
public JButton btnSub; 
public JButton btnMultiply; 
public JButton btnPoint; 
public JButton btnDivide; 
public JButton btnEquals; 
public JButton btnClear; 
public JButton btnExit; 
public static JTextField text; 
public static JTextField text2; 
public static JTextField text3; 


public static void ui() { 
    ui u1= new ui(); 

    JFrame f = new JFrame(); 
    f.setSize(300,500); 
    f.setTitle("my calculator"); 
    f.setResizable(false); 


    JPanel p = new JPanel(); 
    BoxLayout b = new BoxLayout(p,BoxLayout.Y_AXIS); 
    p.setLayout(b); 

    Font fo = new Font("ARIAL",Font.CENTER_BASELINE,30); 
    Font fo1 = new Font("ARIAL",Font.ITALIC,20); 

    u1.text = new JTextField(10); 
    u1.text.setSize(300,100); 
    u1.text.setText("0"); 

    u1.text.setFont(fo1); 
    u1.text.setBackground(Color.gray); 
    p.add(u1.text); 
    u1.text2 = new JTextField(10); 
    u1.text2.setSize(300,100); 
    u1.text2.setText("0"); 

    u1.text2.setFont(fo1); 
    u1.text2.setBackground(Color.gray); 
    p.add(u1.text2); 
    u1.text3 = new JTextField(10); 
    u1.text3.setSize(300,100); 
    u1.text3.setText("0"); 

    u1.text3.setFont(fo1); 
    u1.text3.setBackground(Color.gray); 
    p.add(u1.text3); 
    JPanel p1 = new JPanel(new GridLayout(6,3)); 
    u1.btn1 = new JButton("1"); 
    u1.btn1.setFont(fo); 
    p1.add(u1.btn1); 
    u1.btn1.addActionListener(u1); 

    u1.btn2 = new JButton("2"); 
    u1.btn2.setFont(fo); 
    p1.add(u1.btn2); 
    u1.btn2.addActionListener(u1); 

    u1.btn3 = new JButton("3"); 
    u1.btn3.setFont(fo); 
    p1.add(u1.btn3); 
    u1.btn3.addActionListener(u1); 

    u1.btn4 = new JButton("4"); 
    u1.btn4.setFont(fo); 
    p1.add(u1.btn4); 
    u1.btn4.addActionListener(u1); 

    u1.btn5 = new JButton("5"); 
    u1.btn5.setFont(fo); 
    p1.add(u1.btn5); 
    u1.btn5.addActionListener(u1); 

    u1.btn6 = new JButton("6"); 
    u1.btn6.setFont(fo); 
    p1.add(u1.btn6); 
    u1.btn6.addActionListener(u1); 

    u1.btn7 = new JButton("7"); 
    u1.btn7.setFont(fo); 
    p1.add(u1.btn7); 
    u1.btn7.addActionListener(u1); 

    u1.btn8 = new JButton("8"); 
    u1.btn8.setFont(fo); 
    p1.add(u1.btn8); 
    u1.btn8.addActionListener(u1); 

    u1.btn9 = new JButton("9"); 
    u1.btn9.setFont(fo); 
    p1.add(u1.btn9); 
    u1.btn9.addActionListener(u1); 



    u1.btnEquals = new JButton("="); 
    u1.btnEquals.setFont(fo); 
    u1.btnEquals.setBackground(Color.getHSBColor(30,100,100)); 
    p1.add(u1.btnEquals); 
    u1.btnEquals.addActionListener(u1); 

    u1.btn0 = new JButton("0"); 
    u1.btn0.setFont(fo); 
    p1.add(u1.btn0); 
    u1.btn0.addActionListener(u1); 

    u1.btnPoint = new JButton("."); 
    u1.btnPoint.setFont(fo); 
    u1.btnPoint.setBackground(Color.getHSBColor(30,100,100)); 
    p1.add(u1.btnPoint); 
    u1.btnPoint.addActionListener(u1); 

    u1.btnAdd = new JButton("+"); 
    u1.btnAdd.setFont(fo); 
    u1.btnAdd.setBackground(Color.getHSBColor(30,100,100)); 
    p1.add(u1.btnAdd); 
    u1.btnAdd.addActionListener(u1); 


    u1.btnSub = new JButton("-"); 
    u1.btnSub.setFont(fo); 
    u1.btnSub.setBackground(Color.getHSBColor(30,100,100)); 
    p1.add(u1.btnSub); 
    u1.btnSub.addActionListener(u1); 

    u1.btnMultiply = new JButton("*"); 
    u1.btnMultiply.setFont(fo); 
    u1.btnMultiply.setBackground(Color.getHSBColor(30,100,100)); 
    p1.add(u1.btnMultiply); 
    u1.btnMultiply.addActionListener(u1); 

    u1.btnDivide = new JButton("/"); 
    u1.btnDivide.setFont(fo); 
    u1.btnDivide.setBackground(Color.getHSBColor(30,100,100)); 
    p1.add(u1.btnDivide); 
    u1.btnDivide.addActionListener(u1); 

    u1.btnClear = new JButton("clear"); 
    u1.btnClear.setFont(fo); 
    u1.btnClear.setBackground(Color.getHSBColor(30,100,100)); 
    p1.add(u1.btnClear); 
    u1.btnClear.addActionListener(u1); 

    u1.btnExit = new JButton("exit"); 
    u1.btnExit.setFont(fo); 
    u1.btnExit.setBackground(Color.getHSBColor(30,100,100)); 
    p1.add(u1.btnExit); 
    u1.btnExit.addActionListener(u1); 

    p.add(p1); 
    f.add(p); 

    f.setVisible(true); 


} 
    public void actionPerformed(ActionEvent e){ 
    if(e.getSource()==this.btnAdd){ 
     maths.add(); 

    } 
    else if (e.getSource()==this.btnSub){ 
     maths.sub(); 

    } 
    else if(e.getSource()==this.btnMultiply){ 
     maths.multiply(); 

    } 
    else if(e.getSource()==this.btnDivide){ 
     try { 
      maths.divide(); 
     } catch (Exception e1) { 
      e1.printStackTrace(); 
     } 

    } 
    else if(e.getSource()==this.btnClear){ 
     text.setText("0"); 
     text2.setText("0"); 
     text3.setText("0");  } 
    else if(e.getSource()==this.btnExit){ 
     System.exit(0); 
    } 
    else if (e.getSource()==this.btn1){ 
     if(ui.text.hasFocus()==true){ 
      ui.text.setText("1"); 
     } 
     else{ 
      ui.text2.setText("1"); 
     } 
    } 

    } 





    } 

     public class maths { 
    public static void add(){ 
    float a=0,b=0,c=0; 
    a=Float.parseFloat(ui.text.getText()); 
    b=Float.parseFloat(ui.text2.getText()); 

    c=a+b; 
    ui.text3.setText(String.valueOf(c)); 
    } 
    public static void sub(){ 
    float a=0,b=0,c=0; 
    a=Float.parseFloat(ui.text.getText()); 
    b=Float.parseFloat(ui.text2.getText()); 
    c=a-b; 
    ui.text3.setText(String.valueOf(c)); 
    } 
    public static void multiply(){ 
    float a=0,b=0,c=0; 
    a=Float.parseFloat(ui.text.getText()); 
    b=Float.parseFloat(ui.text2.getText()); 
    c= a*b; 
    ui.text3.setText(String.valueOf(c)); 

    } 
    public static void divide()throws Exception{ 
    float a=0,b=0,c=0; 
    a=Float.parseFloat(ui.text.getText()); 
    b=Float.parseFloat(ui.text2.getText()); 
    c=a/b; 
    ui.text3.setText(String.valueOf(c)); 
    } 

    public class demo { 
    public static void main(String[] args) { 
    ui.ui(); 
    } 
    } 

Answer 1

以下のような問題があります。

ボタンをクリックすると、テキストフィールドのフォーカスが失われます。

Java Determine which textfield has Focus