strexam.java

java可以实现一些小程序的编写

import java.util.*;
class StrExam{
	public static void main(String safd[]){
	
		String s="1234";
        String p=s.replace('1','p');
        p=p.concat(s);
        System.out.println(p);	
        StringBuffer s1=new StringBuffer("abcDEF");
        s1.insert(2,19.56);
        System.out.println(s1);
        
         Date date0=new Date();
         System.out.println(date0);
         System.out.println("year     is :"+date0.getYear());  //------
         
         Random r=new Random(12345678);
         System.out.println("random is "+r.nextInt());
         
         ArrayList al=new ArrayList(10);
         al.add("c");
         al.add(1,"9");
         System.out.println(al);
         
         LinkedList lk=new LinkedList();
         lk.add("ter");
         lk.add(new Integer(2));
         System.out.println(lk);
         
         HashMap hp=new HashMap();
         hp.put("name","john");
         hp.put("age",new Integer(20));
         hp.put("sex","m");
         System.out.println(hp);
         
         Object name=hp.get("name"); //不能用String
         System.out.println("you only get name.  it is "+name);
         
         Vector v=new Vector(10);
         v.add("name");
         v.add(new Double(19.00));
         v.add(new Date());
         System.out.println("\n 向量输出："+v);
         
	}
}


javac -deprecation StrExam.java