java小应用程序 计算器

package computer;//新建的一个名为computer的包 //引入需要用的Java包 如果要使swing组件正常运行，必须引入如下两个包 import java.awt.event.*; import javax.swing.*; //为了使界面美观，我们为显示的区域加上了边框，所以引入以下包 import javax.swing.border.LineBorder; /** * This code was edited or generated using CloudGarden's Jigloo SWT/Swing GUI * Builder, which is free for non-commercial use. If Jigloo is being used * commercially (ie, by a corporation, company or business for any purpose * whatever) then you should purchase a license for each developer using Jigloo. * Please visit www.cloudgarden.com for details. Use of Jigloo implies * acceptance of these licensing terms. A COMMERCIAL LICENSE HAS NOT BEEN * PURCHASED FOR THIS MACHINE, SO JIGLOO OR THIS CODE CANNOT BE USED LEGALLY FOR * ANY CORPORATE OR COMMERCIAL PURPOSE. */ // 新建一个类 名字为computter1 public class computter1 extends JFrame implements ActionListener { // implements ActionListener 集成 发生操作时调用 // 下面定义的是要用的组件和变量 private JMenuItem helpMenuItem; private JMenu jMenu5; private JButton jb7; private JButton jb6; private JButton jb5; private JButton jb4; private JButton jb3; private JButton jb2; private JButton jb1; private JLabel display; private JMenuItem del; // private JSeparator jSeparator1; // private JMenuItem pasteMenuItem; // private JMenuItem copyMenuItem; // private JMenuItem cutMenuItem; private JMenu exit; private JButton jb20; private JButton jb19; private JButton jb18; private JButton jb17; private JButton jb16; private JButton jb15; private JButton jb14; private JButton jb13; private JButton jb12; private JButton jb11; private JButton jb10; private JButton jb9; private JButton jb8; private JMenuItem zt; private JMenuItem copy; private JMenu bj; private JMenuBar jMenuBar1; private int a ; //value1 和value2分别存储两个操作数例如：vvalue1+vlaue2 private String b,value1="off",value2="off",value3="off"; private double sqr[],jb[],v=0,v1=0,sq,sq1; private int m;// 取出显示的字符串的长度 private int ii;//判断是否有小数点，如果ii=0就没有，ii=1就有小数点 private int add,reduce,mult,division;//分别表示+-*/四则运算 /** * Auto-generated main method to display this JFrame */ public static void main(String[] args) { computter1 inst = new computter1();// 实例化 computter1()类 inst.setVisible(true);// 设置窗体可见，否则有时显示不出来 inst.setResizable(false); } public computter1() { super(); initGUI(); } private void initGUI() { try { { ii=0; // 实例化两个数组 double jb[] = new double [20]; double sqr[] = new double[20]; // 设置面板中组件的排列方式为手动排列 getContentPane().setLayout(null); // 设置面板的背景颜色 getContentPane().setBackground( new java.awt.Color(222, 231, 230)); // 设置窗体的标题 this.setTitle("\u8ba1\u7b97\u5668"); { // 实例化标签 display = new JLabel(); // 把标签往面板上添加 getContentPane().add(display); // 设置标签上显示的文本 display.setText("0."); // 设置标签显示的位置，用坐标的方式 display.setBounds(14, 7, 357, 28); // 设置标签的背景颜色 display.setBackground(new java.awt.Color(255, 255, 255)); display.setBorder(new LineBorder( new java.awt.Color(0, 0, 0), 1, false)); } { // 实例化按钮 jb1 = new JButton(); // 往面板中添加按钮 getContentPane().add(jb1); // 设置按钮显示的文本 jb1.setText("backspace"); // 设置按钮显示的位置，以坐标的方式 jb1.setBounds(28, 42, 105, 28); // 为按钮添加事件处理机制 // 事件处理机制委托事件源委托监听者调用事件处理方法 jb1.addActionListener(this); } { jb2 = new JButton(); getContentPane().add(jb2); jb2.setText("CE"); jb2.setBounds(140, 42, 56, 28); jb2.addActionListener(this); } { jb3 = new JButton(); getContentPane().add(jb3); jb3.setText("1/x"); jb3.setBounds(210, 42, 63, 28); jb3.addActionListener(this); } { jb4 = new JButton(); getContentPane().add(jb4); jb4.setText("-"); jb4.setBounds(287, 42, 56, 28); jb4.addActionListener(this); } { jb5 = new JButton(); getContentPane().add(jb5); jb5.setText("1"); jb5.setBounds(49, 77, 84, 28); jb5.addActionListener(this); } { jb6 = new JButton(); getContentPane().add(jb6); jb6.setText("2"); jb6.setBounds(140, 77, 56, 28); jb6.addActionListener(this); } { jb7 = new JButton(); getContentPane().add(jb7); jb7.setText("3"); jb7.setBounds(210, 77, 56, 28); jb7.addActionListener(this); } { jb8 = new JButton(); getContentPane().add(jb8); jb8.setText("/"); jb8.setBounds(273, 77, 56, 28); jb8.addActionListener(this); } { jb9 = new JButton(); getContentPane().add(jb9); jb9.setText("4"); jb9.setBounds(49, 112, 84, 28); jb9.addActionListener(this); } { jb10 = new JButton(); getContentPane().add(jb10); jb10.setText("5"); jb10.setBounds(140, 112, 56, 28); jb10.addActionListener(this); } { jb11 = new JButton(); getContentPane().add(jb11); jb11.setText("6"); jb11.setBounds(210, 112, 56, 28); jb11.addActionListener(this); } { jb12 = new JButton(); getContentPane().add(jb12); jb12.setText("*"); jb12.setBounds(273, 112, 56, 28); jb12.addActionListener(this); } { jb13 = new JButton(); getContentPane().add(jb13); jb13.setText("7"); jb13.setBounds(49, 147, 84, 28); jb13.addActionListener(this); } { jb14 = new JButton(); getContentPane().add(jb14); jb14.setText("8"); jb14.setBounds(140, 147, 56, 28); jb14.addActionListener(this); } { jb15 = new JButton(); getContentPane().add(jb15); jb15.setText("9"); jb15.setBounds(210, 147, 56, 28); jb15.addActionListener(this); } { jb16 = new JButton(); getContentPane().add(jb16); jb16.setText("+"); jb16.setBounds(273, 147, 56, 28); jb16.addActionListener(this); } { jb17 = new JButton(); getContentPane().add(jb17); jb17.setText("0"); jb17.setBounds(49, 182, 84, 28); jb17.addActionListener(this); } { jb18 = new JButton(); getContentPane().add(jb18); jb18.setText("+/-"); jb18.setBounds(140, 182, 56, 28); jb18.addActionListener(this); } { jb19 = new JButton(); getContentPane().add(jb19); jb19.setText("."); jb19.setBounds(210, 182, 56, 28); jb19.addActionListener(this); } { jb20 = new JButton(); getContentPane().add(jb20); jb20.setText("="); jb20.setBounds(273, 182, 56, 28); jb20.addActionListener(this); } } this.setSize(407, 331); { //实例化一个菜单条，菜单必须放在菜单条当中 jMenuBar1 = new JMenuBar(); setJMenuBar(jMenuBar1); { //实例化一个菜单 bj = new JMenu(); //把菜单放在菜单条当中 jMenuBar1.add(bj); //设置菜单显示的文本 bj.setText("编辑"); //获得组件的首选大小 bj.setPreferredSize(new java.awt.Dimension(35, 21)); {//生成菜单对象 copy = new JMenuItem(); //把菜单对象添加到菜单中 bj.add(copy); //设置菜单显示的文本 copy.setText("复制"); //为菜单添加监听器 copy.addActionListener(this); } { zt= new JMenuItem(); bj.add(zt); zt.setText("粘贴"); zt.addActionListener(this); } } { exit = new JMenu(); jMenuBar1.add(exit); exit.setText("文件"); { del = new JMenuItem(); exit.add(del); del.setText("退出"); del.setBounds(0, -21, 28, 21); del.addActionListener(this); } } } } catch (Exception e) { e.printStackTrace(); } } public void actionPerformed(ActionEvent e) { //取出标签中的值�