listdisplay.java.bak

一个java菜单程序

import java.io.*;

class Employee
{
  static int salary[]=new int[10];
       
	public void accept_details() throws IOException
	{
		try
		{
			System.out.println("\n\n\n");
			System.out.println("+++++++++++ BEGIN +++++++++++");
    	System.out.println("Check the salary please :\n");
     	FileInputStream fis=new FileInputStream("data.txt");
			InputStreamReader isr=new InputStreamReader(fis);
			BufferedReader br=new BufferedReader(isr);
			String s=br.readLine();
			String[] str1=s.split("\\ ");
			
			for(int i=0;i<10;i++)
			{
				salary[i]=Integer.parseInt(str1[i]);
				System.out.print(salary[i]+" ");
				if(i==4)System.out.println("");
			}
			
		  System.out.println("\n");
	  }
    
	  catch(IOException e)
	  {
	  	System.out.println("Read Error!");
	  }
	}
	
	
	public void display_max()	throws IOException
	{
		try
		{
			int i=1; 
	  	int temp;
	 		temp=salary[0];
	 		while(i<10)
	 		{
	 			if(salary[i]>temp)
	 			temp=salary[i];
	 			i++;
	 		} 	  
     	
     	FileWriter outF = new FileWriter("result.txt",true);    //true的作用
     	System.out.println("The max salary is : "+temp);
     	outF.write("The max salary is : "+temp+"\r\n");
     	outF.write("-------------------------------------------------------------------\r\n");
		 	outF.close();
    }
    catch(IOException e)
    {
    	System.out.println("display_max Error!");
    }
	}
	 
	
	public void display_min() throws IOException
	{
	 		try
	 		{
	 			int i=1; 
	      int temp;
        temp=salary[0];
	 	    while ( i < 10 )
        {
           if (salary[i]<temp)temp=salary[i];i++;
        }
        FileWriter outF = new FileWriter("result.txt",true);  
        System.out.println("The min salary is : "+temp); 
     		outF.write("The min salary is : "+temp+"\r\n");
     		outF.write("-------------------------------------------------------------------\r\n");
			 	outF.close();
      }
     catch(IOException e)
     {
    	 	System.out.println("display_min() Error!");
     }
	} 
	 
	public void display_avg() throws IOException
  {
	 		try
	 		{
	 			int i; 
	    	int sum;
	    	int avg;
	    	sum=0;
	    	avg=0;
	      
	    	for(i=0;i<=9;i++)sum+=salary[i];
	    	avg=sum/10;
	    	
	    	FileWriter outF=new FileWriter("result.txt",true);
	    	System.out.println("Average : "+ avg);
	    	outF.write("Average : "+avg+"\r\n");
	    	outF.write("-------------------------------------------------------------------\r\n");
		  	outF.close();
	    }
	    catch(IOException e)
	    {
	    	System.out.println("display_avg() Error!");
	    }
	}	 
	
	public void count() throws IOException
	{
	 		try
	 		{
	 			int i,j;
	    	i=0;j=0;
	    
	   		while(i<=9)
	    	{
	    		if(salary[i]>1000)++j;++i;
	    	}
	      
	      FileWriter outF=new FileWriter("result.txt",true);
	    	System.out.println("salary > 1000: "+j+"\n");
	    	outF.write("salary > 1000: "+j+"\r\n");
	    	outF.write("-------------------------------------------------------------------\r\n");
		  	outF.close();
	    }
	    catch(IOException e)
	    {
	    	System.out.print("count() Error!");
	    }
  } 
	
	public void sequence() throws IOException
  {	
    	try
    	{
    		int i,j;
    		int temp; 
	    	i=0;
	    	while (i<9)
	    	{
	    		if(salary[i]>salary[i+1])
	    		{
	    			temp=salary[i];
	    	  	salary[i]=salary[i+1];
	    	  	salary[i+1]=temp;i=0;
	    	  	continue;
	    		}
	      	i++;
	    	}
      	j=0;
      	
      	FileWriter outF=new FileWriter("result.txt",true);
      	System.out.println("min->max: ");
		  	outF.write("min->max: ");
	    	do
      	{
      		System.out.print(salary[j]);
        	outF.write(salary[j]+" ");	
        	//修改outF.write(salary[j]);由于没有空开，所以把数字与'<'痴埋一齐，造成乱码！
        	//其他噶全部改为"\r\n"了，txt显示无问题了！
        	if(j!=9) System.out.print(" < ");
        	if(j!=9) outF.write("<");
        	++j;
      	}while (j<=9);
          
      	System.out.println("\n\n");
      	outF.write("\r\n");
          
      	System.out.println( "max->min: ");
      	outF.write("max->min: ");
      	j=9;
      	do
      	{
      		System.out.print(salary[j]);
        	outF.write(salary[j]+" ");
        	if(j!=0) System.out.print(" > ");
        	if(j!=0) outF.write(">");
        	--j;
      	}while(j>=0);
      	System.out.println("\n\n\n");    
      	outF.write("\r\n");
      	outF.write("-------------------------------------------------------------------\r\n");
		  	outF.close();
    	}
    	catch(IOException e)
    	{
    		System.out.println("sequence Error!");
    	}
  }
}//结束类的定义

class NewEmployee extends Employee
{
	int s[]=new int[5];
	public void section() throws IOException
	{
		try
		{
			int i,k;
  		for(k=0;k<=4;k++)s[k]=0;
			for(i=0;i<= 9;i++)
			{	
				if(salary[i]<=1000)s[0]++;
		  	else if(salary[i]<=2000)s[1]++;
				else if(salary[i]<=3000)s[2]++;
      	else if(salary[i]<=4000)s[3]++;
				else s[4]++;
			}
			System.out.println("salary <= 1000 : "+s[0]);
			System.out.println("1000 < salary <= 2000 : "+s[1]);
			System.out.println("2000 < salary <= 3000 : "+s[2]);
			System.out.println("3000 < salary <= 4000 : "+s[3]);
			System.out.println("4000 < salary : "+s[4]);
		
			FileWriter outF=new FileWriter("result.txt",true);
			outF.write("show section : \r\n");
    	outF.write("salary <= 1000 : "+ s[0]+"\r\n");
			outF.write("1000 < salary <= 2000 : "+s[1]+"\r\n");
			outF.write("2000 < salary <= 3000 : "+s[2]+"\r\n");
			outF.write("3000 < salary <= 4000 : "+s[3]+"\r\n");
			outF.write("4000 < salary : "+s[4]+"\r\n");
			outF.write("-------------------------------------------------------------------\r\n");
			outF.close();
    }
    catch(IOException e)
    {
    	System.out.println("section() Error!");
    }
  }
}

public class ListDisplay
{
	public static void main(String args[]) throws IOException
	{
		try
		{
    	NewEmployee e1=new NewEmployee();
     	e1.accept_details();
     
     	loop1:
     	while(true)
     	{	                     
				System.out.println("\n\n\n");
        System.out.println("============Menu=============");
        System.out.println("| 1.display max salary      |");
        System.out.println("| 2.display min salary      |");
        System.out.println("| 3.display average salary  |");
        System.out.println("| 4.display salary > 1000   |");
        System.out.println("| 5.display sequence        |");
        System.out.println("| 6.display section         |");
        System.out.println("| 0.exit                    |");
        System.out.println("-----------------------------\n");
        System.out.print("Please choose a number(0-5):");
  
  			BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
  			String n=br.readLine();
  			int m=Integer.parseInt(n);	
  				
  			loop2:
  			switch(m)	//强制转换类型
        {
        	case 1:e1.display_max();break loop2; //调用每个函数之前最好清屏
          case 2:e1.display_min();break loop2;
   	      case 3:e1.display_avg();break loop2;
   	      case 4:e1.count();break loop2;
   	      case 5:e1.sequence();break loop2;
   	      case 6:e1.section();break loop2;
   	      default:break loop2;
        }
        if(m==0) break loop1;
    	}
    }
    catch(IOException e)
    {
    	System.out.println("Error!");
    }
	}
}