java计算器程序

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1、import java.awt.Container;import java.awt.GridLayout;/*GridLayout 类是一个布局处理器，它以矩形网格形式对容器的组件进行布置。容器被分成大小相等的矩形，一个矩形中放置一个组件*/import java.awt.BorderLayout;/*BorderLayout是一个布置容器的边界布局，它可以对容器组件进行安排，并调整其大小，使其符合下列五个区域：南、北、东、西和中间区域。每个区域最多只能包含一个组件，并通过相应的常量进行标识：NORTH、SOUTH、EAST、WEST 和 CENTER。当使用边界布局将一个组件添加到容器中时，

2、要使用这五个常量之一*/import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JPanel;import javax.swing.JTextField;/* author Administrator*/public class calculator extends JFrame implements ActionListener JFrame jf; JTextFi

3、eld jtf; String b = new String +,-,*,/,.; JButton jis = new JButton(=); private int temp = 0; private float result = 0; private float fnumber = 0, bnumber = 0; public calculator() init(); public void init() jf = new JFrame(); jtf = new JTextField(); Container c = jf.getContentPane();/Returns the con

4、tentPane object for this frame. jtf.setHorizontalAlignment(JTextField.RIGHT);/设置文本的水平对齐方式 jtf.setLayout(new GridLayout(); c.add(jtf,BorderLayout.NORTH);/ JPanel jp = new JPanel(); jp.setLayout(new GridLayout(4,4);/对于GridLayout(int rows,int cols)详情请参见API c.add(jp,BorderLayout.CENTER);/*这里刚开始犯了一低级错误，将

5、c写成了jp，逻辑调用都出现了问题*/ JButton ja = new JButton10; JButton jb = new JButton5; for(int i = 0; i 10; i+) jai = new JButton( + i); jai.addActionListener(this); for(int j = 0; j 5; j+) jbj = new JButton( + bj); jbj.addActionListener(this); for(int i = 0; i 10; i+) jp.add(jai); for(int j = 0; j 5; j+) jp.ad

6、d(jbj); jp.add(jis); jis.addActionListener(this); jf.setSize(200,300); jf.setVisible(true); public void actionPerformed(ActionEvent e) String s = e.getActionCommand(); if(s.equals(+) this.fnumber = Float.parseFloat(this.jtf.getText(); this.jtf.setText(); this.temp = 1; else if(s.equals(-) this.fnumb

7、er = Float.parseFloat(this.jtf.getText(); this.jtf.setText(); this.temp = 2; else if(s.equals(*) this.fnumber = Float.parseFloat(this.jtf.getText(); this.jtf.setText(); this.temp = 3; else if(s.equals(/) this.fnumber = Float.parseFloat(this.jtf.getText(); this.jtf.setText(); this.temp = 4; else if(s

8、.equals(.) if(jtf.equals() jtf.setText(0.); else jtf.setText(jtf.getText() + .); else if(s.equals(=) this.bnumber = Integer.parseInt(this.jtf.getText(); switch(this.temp) case 1: result = fnumber + bnumber; this.jtf.setText(String.valueOf(result); break; case 2: result = fnumber - bnumber; this.jtf.

9、setText(String.valueOf(result); break; case 3: result = fnumber * bnumber; this.jtf.setText(String.valueOf(result); break; case 4: result = fnumber / bnumber; this.jtf.setText(String.valueOf(result); break; else jtf.setText(jtf.getText() + e.getActionCommand(); public static void main(String args) new calculator();