Java实验报告-计算器（AWT图形界面）

最新推荐文章于 2021-03-07 18:15:59 发布

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最新推荐文章于 2021-03-07 18:15:59 发布 · 2.7k 阅读

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一、实验目的

掌握图形用户界面的设计与实现。

二、实验内容

使用图形界面制作一个计算器并实现相应功能。

三、实验步骤

public class firstapp extends Applet implements ActionListener {

    private String[] LEFTKEYS = { "7", "8", "9", "4", "5", "6", "1", "2", "3", "0", "+/-", "." };

    private String[] RIGHTKEYS = { "/", "sqrt", "ln", "*", "sin", "<-", "-", "cos", "CE", "+", "y^x", "=" };

    private Button leftKeys[] = new Button[LEFTKEYS.length];

    private Button rightKeys[] = new Button[RIGHTKEYS.length];

    private TextField resultText = new TextField("0");



    private double resultNum = 0.0;

    private String operator = "=";

    private boolean startInput = true;



    public firstapp() {

        init();

    }

   

    public void init() {

        resultText.setEditable(false);

        resultText.setBackground(Color.WHITE);

        Panel leftPanel = new Panel();// 左边按钮

        leftPanel.setLayout(new GridLayout(4, 3, 3, 3));

        for (int i = 0; i < LEFTKEYS.length; i++) {

            leftKeys[i] = new Button(LEFTKEYS[i]);

            leftPanel.add(leftKeys[i]);

            leftKeys[i].setForeground(Color.RED);

        }

        Panel rightPanel = new Panel();

        rightPanel.setLayout(new GridLayout(4, 3, 3, 3));

        for (int i = 0; i < RIGHTKEYS.length; i++) {

            rightKeys[i] = new Button(RIGHTKEYS[i]);

            rightPanel.add(rightKeys[i]);

            rightKeys[i].setForeground(Color.blue);

        }

        this.setLayout(new BorderLayo