tools.java

J2EE指南

package javaBeanClass;
import java.util.*;
public class Tools
{
	//替换字符串
	public static String replace(String replaceStr,String replaceFromStr,String replaceToStr)
	{
		String tempStr=replaceStr;
		replaceStr="";
		while(tempStr.indexOf(replaceFromStr)!=-1)
		{
			replaceStr+=tempStr.substring(0,tempStr.indexOf(replaceFromStr));
			replaceStr+=replaceToStr;
			tempStr=tempStr.substring(tempStr.indexOf(replaceFromStr)+replaceFromStr.length());
		}
		return replaceStr+tempStr;
	}
	public static int[] getRandomArray(int size){
		int ran[]=new int[size];
		boolean status[]= new boolean[size];
		for(int i=0;i<size;i++){
			int random=(int)(Math.random()*size+1);
			if(status[random-1]==true){
				i--;
				continue;	
			}
			status[random-1]=true;
			ran[i]=random;
		}
		return ran;
	}
	public static void main(String arge[]){
		int ran[]=Tools.getRandomArray(30);
		for(int i=0;i<ran.length;i++){
			System.out.println (ran[i]);	
		}	
	} 
}