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Re:寻求好心人帮我修改一下这个程序 [Re:zwguo1008]

chenshuai123

发贴: 2
积分: 0

于 2007-11-05 00:17

我是新手,才学半个月.这是我写的,大家给点意见,谢谢大家,共同提高:
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class Computer implements ActionListener{
  private TextField tf = new TextField("0",30);
private Button[] b = new Button[20];
private String[] label = {"back","CE","C","+","7",
  "8","9","-","4","5","6","*","1","2","3","/","0",
  "+/-",".","="};
private boolean flag = false;
private double d1 = 0;
private double d2 = 1;
private String operator = "+";
  public Computer(){
    Frame f = new Frame("Computer");
  f.add(tf,"North");
  Panel p = new Panel();
  MenuBar mb = new MenuBar();
  Menu m1 = new Menu("编辑");
  Menu m2 = new Menu("帮助");
  MenuItem mi1 = new MenuItem("复制");
  MenuItem mi2 = new MenuItem("粘贴");
  MenuItem mi3 = new MenuItem("关于计算器");
  m1.add(mi1);
  m1.add(mi2);
  m2.add(mi3);
  mb.add(m1);
  mb.add(m2);
  f.setMenuBar(mb);
  p.setLayout(new GridLayout(5,4,5,5));
  for(int i=0;i<b.length;i++){
    b[i] = new Button(label[i]);
   p.add(b[i]);
   b[i].addActionListener(this);
  }
  f.add Camera

;
  tf.setEditable(false);
  f.setVisible(true);
  f.setResizable(false);
  f.pack();
  }
  public static void main(String[] args) {
    new Computer();
  }
  public void actionPerformed(ActionEvent ae) {
    String command = ae.getActionCommand();
    if(command.equals("0")||command.equals("1")||
        command.equals("2")||command.equals("3")||
        command.equals("4")||command.equals("5")||
        command.equals("6")||command.equals("7")||
        command.equals("8")||command.equals("9")){
      if(flag){
        tf.setText(tf.getText()+command);
      }else{
        tf.setText(command);
        flag = true;
      }
    }else if(command.equals(".")){
      String temp = tf.getText();
      if(temp.indexOf(".")==-1){
        tf.setText(temp+".");
        flag=true;
      }
    }else if(command.equals("+")||command.equals("-")||
        command.equals("*")||command.equals("/")){
      d1 = Double.parseDouble(tf.getText());
      operator = command;
      flag = false;
    }else if(command.equals("=")){
      d2 = Double.parseDouble(tf.getText());
      if(operator.equals("+")){
        d1 = d1+d2;
      }else if(operator.equals("-")){
        d1 = d1-d2;
      }else if(operator.equals("*")){
        d1 = d1*d2;
      }else if(operator.equals("/")){
        d1 = d1/d2;
      }
      tf.setText(""+d1);
      flag = false;
    }
  }

}

话题树型展开

人气	标题	作者	字数	发贴时间
6510	寻求好心人帮我修改一下这个程序	zwguo1008	3013	2007-11-01 10:19
5529	Re:寻求好心人帮我修改一下这个程序	andy_wang_5	3442	2007-11-01 11:04
5242	Re:寻求好心人帮我修改一下这个程序	andy_wang_5	87	2007-11-01 11:13
5218	Re:寻求好心人帮我修改一下这个程序	chenshuai123	2477	2007-11-05 00:17

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