java计算器程序

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，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;JTextField 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 contentPane 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.add(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.fnumber = 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.equals(“.“)if(jtf.equals(“)jtf.setText(“0.“);elsejtf.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.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(St