myapp.java

数据结构 包括数组(Array包) 和二叉树(Tree) 链表(Linelist包) 等等

package MyLib;
import java.util.*;
import java.io.*;
public class MyApp {
	Random rn;
	BufferedReader br;
	InputStreamReader in;
	String s;
	public MyApp(){
		 rn=new Random();
		 in=new InputStreamReader(System.in);
		 br=new BufferedReader(in);
		 s=" ";
	}
	public int nextInt(int start,int end){
		return (start+rn.nextInt(end));
	}
    public  String randomString(int size,int rangStart,int rangEnd){
    	
    	char[] ch=new char[size];
    	char chUnit;
    	for(int i=0;i<ch.length;i++){
    		chUnit=(char)(rangStart+rn.nextInt(rangEnd));
    		ch[i]=chUnit;
    	}
    	String result=new String(ch);
    	return result;
    }
    
	public String readString() throws IOException{
		
	   s =br.readLine();

	    return s;
	    
	
	}
	
	public String readInt() throws IOException{
		s=br.readLine();
		while(s.matches("[^0-9]")){
			System.out.println("please enter a number");
			s=br.readLine();
			
		}
	
		return s;
	
	}
	
}