arraytest.java.bak

通过用JBuilder工具编写

import java.util.Arrays;
class ArrayTest
{
	public static void main(String[] args)
	{
		/*int[] num=new int[]{3,2,1};
		//int[] num2=new int[10];
	  //System.arraycopy(num1,1,num2,8,2);
	  Arrays.sort(num);
	  for(int i=0;i<num.length;i++)
	  {
	  	System.out.println(num[i]);	
	  }*/
	  /*Point[] pts1=new Point[] {new Point(1,1),new Point(2,2),new Point(3,3)}; 
	  Point[] pts2=new Point[3];
	  System.arraycopy(pts1,0,pts2,0,pts1.length);
	  for(int i=0;i<pts2.length;i++)
	  {
	  	System.out.println(pts2[i].x+","+pts2[i].y);	
	  }
	  pts2[1].x=5;
	  pts2[1].y=5;
	  System.out.println(pts2[1].x+","+pts2[1].y);
	 }*/
	 Student[] ss=new Student[]{new Student(1,"zhangsan"),
	 	                          new Student(2,"Lisi"),
	 	                          new Student(3,"Wangwu"),
	 	                          new Student(3,"Lucy")};
	Arrays.sort(ss);
	//for(int i=0;i<ss.length;i++)
	  //{
	  	//System.out.println(ss[i]);	
	  //}
	int index=Arrays.binarySearch(ss,new Student(2,"Lisi"));
	System.out.println("index="+index);
	System.out.println("element="+ss[index]);
}
}
class Student implements Comparable
{
	String name;
	int num;
	Student(int num,String name)
	{
		this.num=num;
		this.name=name;
	}
	public String toString()
	{
		return "num="+num+","+"name="+name;
	}
	public int compareTo(Object o)
	{
		Student s=(Student)o;
		int result=num>s.num?1:(num==s.num?0:-1);
		if(0==result)
		{
			result=name.compareTo(s.name);
		}
		return result;
	}
}
class Point
{
	 	int x;
	 	int y;
	 	Point(int x,int y)
	 	{
	 		this.x=x;
	 		this.y=y;
	 	}
}