Question

我刚刚开始在java中使用接口，我只需要一个窗口就可以做我需要的东西。但我现在想要将两个窗口链接在一起，例如。

第1帧打开。用户选择button1（输入数据）。第2帧打开，以便用户输入数据。

第1帧的代码：

import javax.swing.*;

public class Task_3 extends JFrame {
    private Button btn1, btn2, btn3;
    public Task_3(){

      setLayout(new FlowLayout());

      btn1 = new Button("Enter data");
      add(btn1);
      btn2 = new Button("Check who is going");
      add(btn2);
      btn3 = new Button("View costs");
      add(btn3);

      setTitle("Event Costs");
      setSize(280, 150);
      setVisible(true);

      // close the window
      addWindowListener(new WindowAdapter()
      {
      public void windowClosing(WindowEvent e)
      {
         dispose();
         System.exit(0); //calling the method is a must
      }
      });

    }
    public static void main(String[] args){
        new Task_3();
    }
}

第2帧的代码：

import java.awt.*;
import java.awt.event.*;

public class Task1GUI extends Frame implements ActionListener {
    private Label lblInput;
    private Label lblOutput;
    private TextField tfInput;
    private TextField tfOutput;
    private int sum = 0;

    public Task1GUI(){
        setLayout( new FlowLayout());

        lblInput = new Label("Enter number of students: ");
        add(lblInput);

        tfInput = new TextField(5);
        add(tfInput);

        tfInput.addActionListener(this);

        lblOutput = new Label("The cost per student is: ");
        add(lblOutput);

        tfOutput = new TextField(20);
        tfOutput.setEditable(false);
        add(tfOutput);

        setTitle("Task1GUI");
        setSize(350, 120);
        setVisible(true);

        addWindowListener(new WindowAdapter()
      {
      public void windowClosing(WindowEvent e)
      {
         dispose();
         System.exit(0); //calling the method is a must
      }
      });
    }
    public static void main(String[] args){

        new Task1GUI();
    }

    @Override
    public void actionPerformed(ActionEvent evt){
        int numOfStudents = Integer.parseInt(tfInput.getText());
        int coachCost = 550;
        int entrycost = 30;
        int totalcost;
        int numFree;
        int Discount;
        int costPerPerson;
        if(numOfStudents<45){
        totalcost = coachCost+(numOfStudents*30);
        numFree = numOfStudents/10;
        Discount = numFree*30;
        costPerPerson = (totalcost-Discount)/numOfStudents;
        tfInput.setText("");
        tfOutput.setText(costPerPerson+"");
    }
    else{
        tfOutput.setText("Too mant students entered");
    }
    }
}

基本上我想帮助将这两个程序链接在一起，以便用户可以打开第一帧选择他们想要做的动作。

直到最近我一直在使用控制台，所以如果我的代码不完美我会道歉但我真的很感激任何帮助。

如果这有帮助的话，我最终希望这个程序https://repl.it/repls/FondAptXeme有一个GUI。

谢谢

Answer 1

我建议您创建一个新的JFrame并将新JFrame的可见性设置为＆＃34; true＆＃34;在按钮的动作监听器中。像这样：

private JFrame secondFrame = new JFrame("My 2nd Window!");

然后在你的button1动作监听器中执行：

secondFrame.setVisible(true);

编辑：

import javax.swing.*;

public class Task_3 extends JFrame {
    private Button btn1, btn2, btn3;
    private Task1GUI task1Gui = new Task1GUI();

    public Task_3(){

      setLayout(new FlowLayout());

      btn1 = new Button("Enter data");
      btn1.addActionListener(this); //this refers to your current frame
      add(btn1);
      btn2 = new Button("Check who is going");
      add(btn2);
      btn3 = new Button("View costs");
      add(btn3);

      setTitle("Event Costs");
      setSize(280, 150);
      setVisible(true);

      // close the window
      addWindowListener(new WindowAdapter()
      {
      public void windowClosing(WindowEvent e)
      {
         dispose();
         System.exit(0); //calling the method is a must
      }
      });

    }
    public static void main(String[] args){
        new Task_3();
    }

    public void actionPerformed(ActionEvent e) {
        task1Gui.setVisible(true);
    }
}

干杯。

Answer 2

你有两个程序（2x主程序），但第二个程序（Task1Gui）实际上应该只是你第一堂课中的一个对象。

在Task3中声明Task1Gui并向其中一个按钮添加actionListener（在这种情况下为btn1）：

private Task1Gui enterDataFrame;

btn1.addActionListener(new ActionListener() {

    @Override
    public void actionPerformed(ActionEvent arg0) {
        // TODO Auto-generated method stub
        enterDataFrame= new Task1Gui();
    }
});

确保更改Task1Gui的main方法并更改windowListener，以便只关闭和处理窗口，而不是整个程序：

addWindowListener(new WindowAdapter(){
   public void windowClosing(WindowEvent e)
   {
      dispose();
   }
});

另外，我会将tfInput文本字段的actionListener更改为匿名内部类型：

tfInput.addActionListener(new ActionListener() {

                @Override

                public void actionPerformed(ActionEvent arg0) {
                    // TODO Auto-generated method stub
                    int numOfStudents = Integer.parseInt(tfInput.getText());
                    int coachCost = 550;
                    int entrycost = 30;
                    int totalcost;
                    int numFree;
                    int Discount;
                    int costPerPerson;

                    if(numOfStudents < 45){
                        totalcost = coachCost + (numOfStudents * 30);
                        numFree = numOfStudents / 10;
                        Discount = numFree * 30;
                        costPerPerson = (totalcost-Discount)/numOfStudents;
                        tfInput.setText("");
                        tfOutput.setText(costPerPerson + "");
                    }

                    else {
                        tfOutput.setText("Too mant students entered");
                    }
                }
            });

Answer 3

我是这样做的，如果需要，可以尝试

JButton btnNewButton_5 =新的JButton（“SiparişVer”）;

setTheme(selectedTheme.theme);

在java

3 个答案: