java - 如何使用面板管理我的 java applet？

Question

我使用 java 编写了一个小每周支付小程序。但当谈到获得一个像样的布局时，我却一无所知。我开始将面板和网格布局添加到代码中。但我不知道如何实现它们。

这是代码。

import java.awt.*;
import java.applet.*;
import java.awt.event.*;
import java.text.DecimalFormat;
import javax.swing.*;

public class WeeklyPayCalculatorApplet extends Applet implements ActionListener {

   //define variables, Button, label, TextField
      //Create a Button class




      Label title1 = new Label("Western Distribution");
      Label title2 = new Label("Weekly Payroll Calculation");
      Label lblEnterMins = new Label("Enter Total Minutes Worked: ");
      Label lblEnterHours = new Label("Enter Hourly Pay Rate: ");
      Label lblHoursWorked = new Label("Hours Worked:");
      Label lblLeftOver = new Label("Leftover Miutes:");
      Label lblWeekPay = new Label("Weekly Pay:");

      Label hoursWorked = new Label("  ");
      Label leftoverMins = new Label("  ");
      Label weeklyPay = new Label("  ");

      TextField txtMinutes = new TextField(10);
      TextField txtRate = new TextField(10);


   Button btnPay = new Button("Weekly Pay");
   Button btnClear = new Button("Clear");
   Button btnExit=new Button("Exit");


    //Panels

    Panel pnlCenter = new Panel();
    Panel pnlSouth = new Panel();
    Panel pnlNorth = new Panel();

        //Grids
    GridLayout gridLay1 = new GridLayout(1,3);


      public void init() {
      // add the displayable objects;
      add("Center", pnlCenter);
      pnlCenter.setLayout(gridLay1);
        pnlCenter.add(title1);
        pnlCenter.add(title2);
        add(lblEnterMins);
        add(txtMinutes);
        add(lblEnterHours);
        add(txtRate);

        add(btnPay);
        add(btnClear);
        add(btnExit);

        add(lblHoursWorked);
        add(hoursWorked);
        add(lblLeftOver);
        add(leftoverMins);
        add(lblWeekPay);
        add(weeklyPay);




   //Attach event to Button
        btnPay.addActionListener(this);
        btnClear.addActionListener(this);
        btnExit.addActionListener(this);

   }

   public void paint(Graphics g) {
      //Draw any pictures
      //Make sure the picture is in the same directory as the .class files


   }

   public void actionPerformed(ActionEvent e) {
   //This method will fire when button is pressed
   //define temporary variables

   Integer hour = 60;
   Double dblWeeklyPay;
   Integer intLeftOvers;
   Integer inthoursWorked;



   Integer intMinutes = Integer.parseInt(txtMinutes.getText());
   Double dblRate = Double.parseDouble(txtRate.getText());

   inthoursWorked = intMinutes / hour;

   intLeftOvers =  600 - intMinutes;


   dblWeeklyPay = (intMinutes / hour) * dblRate;



hoursWorked.setText(inthoursWorked);
leftoverMins.setText(intLeftOvers);
weeklyPay.setText(dblWeeklyPay);




   }

}

Answer 1

说到布局，请阅读 Using Layout Managers将是一个好的开始。我个人喜欢使用GridBagLayout因为它给了你很大的控制权，但根据你的需要，它可能会太过分。

但如果您觉得它太令人畏惧，您可以随时使用 Netbeans或Eclipse (eclipse 更开源，也是我最喜欢的)以可视化方式设计你的 GUI。