where_1.java

里面写的是 一些J2SE 的日历和 计算机的代码 还有时间钟表的代码 供初学者参考

//计算器2008-10-31
import java.awt.*;
import java.awt.event.*;
import java.io.*;


public class Where_1 extends Frame implements ActionListener{
	
   Label la=new Label("0");
   String[] str={new String(""),new String(""),new String("")};  
   String   s="";   //储存运算符号
    int a=0;  int b=1;   int d=0;
	double num0,num1;
	
	public void change(){
    	if(a==0){
    	    a=1;b=0;
    	}	  
		else  {
			a=0;b=1;
	   }		    
    }
    //数据转换
    public void conversion(){
    	num0=Double.parseDouble(str[a]);
    	num1=Double.parseDouble(str[b]);
    }
    //强行运算
    public void CalculationOfForce(){
    	if(str[a].equals("")||str[b].equals("")){
    		if(str[a].equals(""))  la.setText(str[b]);
    		if(str[b].equals(""))  la.setText(str[a]);
    	}  
    	else {
    	    if(s.equals("+"))        Adder();		     
		    else if(s.equals("-"))   Subtraction();  
		    else if(s.equals("*"))   Multiplication();    
		    else if(s.equals("/"))   Division(); 
		     
    	}
    }
	//除法
	public void Division(){
    	if(str[a].equals("0"))  la.setText("除数不能为0！");
    	else{
    		conversion();
    		str[b]=String.valueOf(num1/num0);
    		la.setText(str[b]);
    	}
    }
    //乘法
    public void Multiplication(){
    	conversion();
        str[b]=String.valueOf(num0*num1);
        la.setText(str[b]);
    }
    //减法
    public void Subtraction(){
    	num0=Double.parseDouble(str[a]);
    	num1=Double.parseDouble(str[b]);
    	str[b]=String.valueOf(num1-num0);
    	la.setText(str[b]);
    }
    //加法
    public void Adder(){
    	conversion();
    	str[b]=String.valueOf(num1+num0);
    	la.setText(str[b]);
    }
    //取出数字开头的0
    public void RemovalZero(){
    	if(str[a].startsWith("0")) {
    		if(str[a].length()==1) str[a]="";
    		else  str[a].substring(1,str[a].length());
    	}
    }
    
    public Where_1(String title){
      
      	super(title);
    	 
		setLayout(null);
		setBackground(new Color(166,166,166));
	
	     Button n0=new Button("0");
	     n0.addActionListener(this);
	     Button n1=new Button("1");
	     n1.addActionListener(this);
	     Button n2=new Button("2");
	     n2.addActionListener(this);
	     Button n3=new Button("3");
	     n3.addActionListener(this);
	     Button n4=new Button("4");
	     n4.addActionListener(this);
	     Button n5=new Button("5");
	     n5.addActionListener(this);
	     Button n6=new Button("6");
	     n6.addActionListener(this);
	     Button n7=new Button("7");
	     n7.addActionListener(this);
	     Button n8=new Button("8");
	     n8.addActionListener(this);
	     Button n9=new Button("9");
	     n9.addActionListener(this);
	
	
         Button backspack=new Button("backspack");
         backspack.addActionListener(this);
	     Button ce=new Button("CE");
	     ce.addActionListener(this);
    	 Button c=new Button("C");
    	 c.addActionListener(this);
    	 Button a=new Button("+/-");
    	 a.addActionListener(this);
    	 Button add=new Button("+");
    	 add.addActionListener(this);
    	 Button sub=new Button("-");
    	 sub.addActionListener(this);
     	 Button mul=new Button("*");
     	 mul.addActionListener(this);
    	 Button div=new Button("/");
    	 div.addActionListener(this);
    	 Button numpoint=new Button(".");
    	 numpoint.addActionListener(this);
    	 Button sqrt=new Button("sqrt");
    	 sqrt.addActionListener(this);
    	 Button percent=new Button("%");
    	 percent.addActionListener(this);
    	 Button countdown=new Button("1/x");
    	 countdown.addActionListener(this);
    	 Button equate=new Button("=");
    	 equate.addActionListener(this);
    	 Button mc=new Button("MC");
    	 Button mr=new Button("MR");
    	 Button ms=new Button("MS");
    	 Button ma=new Button("M+");
    	 
		 
		 la.setBounds(20,60,250,30);
	   	 backspack.setBounds(20,100,70,30);
		 ce.setBounds(110,100,70,30);
		 c.setBounds(200,100,70,30);
		
		 mc.setBounds(20,140,30,30);
		 n7.setBounds(63,140,35,30);
		 n8.setBounds(106,140,35,30);
		 n9.setBounds(149,140,35,30);
		 div.setBounds(192,140,35,30);
		 sqrt.setBounds(235,140,35,30);
		 
		 mr.setBounds(20,180,30,30);
		 n4.setBounds(63,180,35,30);
		 n5.setBounds(106,180,35,30);
		 n6.setBounds(149,180,35,30);
		 mul.setBounds(192,180,35,30);
		 percent.setBounds(235,180,35,30);
		
		 ms.setBounds(20,220,30,30);
		 n1.setBounds(63,220,35,30);
		 n2.setBounds(106,220,35,30);
		 n3.setBounds(149,220,35,30);
		 sub.setBounds(192,220,35,30);
		 countdown.setBounds(235,220,35,30);
		  
		 ma.setBounds(20,260,30,30);
	     n0.setBounds(63,260,35,30);
		 a.setBounds(106,260,35,30);
		 numpoint.setBounds(149,260,35,30);
		 add.setBounds(192,260,35,30);
		 equate.setBounds(235,260,35,30);
		 
		add(la);
		add(backspack);	add(ce);	add(c);
		add(mc); add(n7); add(n8);  add(n9); add(div); add(sqrt);
		add(mr); add(n4); add(n5); add(n6); add(mul); add(percent);
		add(ms); add(n1); add(n2); add(n3); add(sub); add(countdown);
		add(ma); add(n0); add(a); add(numpoint); add(add); add(equate);
		
		MyMenuBar mb=new MyMenuBar(this);
		
		mb.addMenus(new String[]{"编辑","查看","帮助"});
		mb.addMenuItems(0,new String[]{"复制","粘贴",null,"退出"});
		mb.addMenuItems(1,new String[]{"标准型","科学型",null,"数字分组"});
	    mb.addMenuItems(2,new String[]{"帮助主题",null,"关于计算器"});
		
		mb.addActionListener(this);
      	
      	addWindowListener(new WindowAdapter (){
	    	public void windowClosing(WindowEvent e){
	    		Where_1.this.dispose();
	    	}
	    });	
    }
    //覆盖
  public void actionPerformed(ActionEvent e){
  	    String selected=e.getActionCommand();
  	    if(selected.equals("退出")){
  	    	dispose();
  	    }
  	    else if(selected.equals("backspack")){
  	    	la.setText("0");
			 
  	    }
  	    else if(selected.equals("C")){
  	    	la.setText("0");
			str[0]=""; str[1]=""; str[2]=""; s=""; a=0; b=1; d=0;
  	    }
  	    else if(selected.equals(".")){
			str[2]=e.getActionCommand();
			str[a]=str[a]+str[2];
			la.setText(str[a]);
		}
  	    else if(selected.equals("0")){
			str[2]=e.getActionCommand();
			str[a]=str[a]+str[2];
			la.setText(str[a]);
		}
		else if(selected.equals("1")){
			str[2]=e.getActionCommand();
			str[a]=str[a]+str[2];
			la.setText(str[a]);
		}
		else if(selected.equals("2")){
			str[2]=e.getActionCommand();
			str[a]=str[a]+str[2];
			la.setText(str[a]);
		}
		else if(selected.equals("3")){
			str[2]=e.getActionCommand();
			str[a]=str[a]+str[2];
			la.setText(str[a]);
		}
		else if(selected.equals("4")){
			str[2]=e.getActionCommand();
			str[a]=str[a]+str[2];
			la.setText(str[a]);
		}
		else if(selected.equals("5")){
			str[2]=e.getActionCommand();
			str[a]=str[a]+str[2];
			la.setText(str[a]);
		}
		else if(selected.equals("6")){
			str[2]=e.getActionCommand();
			str[a]=str[a]+str[2];
			la.setText(str[a]);
		}
		else if(selected.equals("7")){
			str[2]=e.getActionCommand();
			str[a]=str[a]+str[2];
			la.setText(str[a]);
		}
		else if(selected.equals("8")){
			str[2]=e.getActionCommand();
			str[a]=str[a]+str[2];
			la.setText(str[a]);
		}
		else if(selected.equals("9")){
			str[2]=e.getActionCommand();
			str[a]=str[a]+str[2];
			la.setText(str[a]);
		}
		else if(selected.equals("+")){
			s=selected;
			change();
			
		}
		else if(selected.equals("-")){
			s=selected;
			change();
		}
		else if(selected.equals("*")){
			s=selected;
			change();
		}
		else if(selected.equals("/")){
			s=selected;
			change();
		}
		else if(selected.equals("sqrt")){
			if(str[a].equals("0")) la.setText("0不能开方");
			else{
    	    }
		}
		else if(selected.equals("%")){
			
		}
		else if(selected.equals("1/x")){
			
		}
		else if(selected.equals("=")){
			CalculationOfForce();
		}
  	}
  
  
  public static void main(String[] args){
		Where_1 f=new Where_1("计算器");
	    
		 f.setSize(290,300);
		 f.setVisible(true);
		 f.setResizable(false);
  }
}