谁有一些简单的java程序源代码呀

建议你先找些题来做做,比如说排序，求质数这些,这样比看代码学得快

你好！我也是学java的，我特意写了些代码，希望对你有帮助，如果并明白请Hi我！
public class vaildateText {
/**程序入口**/
public static void main(String[] args) {
// TODO Auto-generated method stub
Integer a=40;
Integer b=100;
//java输出语句
System.out.println("before sup....");
System.out.println("a is "+a);
System.out.println("b is "+b);
//调用方法sup();
sup(a,b);
System.out.println("after sup....");
System.out.println("a is "+a);
System.out.println("b is "+b);
}
public static void sup(Integer aa,Integer bb){
Integer p=aa;
aa=bb;
bb=p;
System.out.println("in sup....");
System.out.println("aa is "+aa);
System.out.println("bb is "+bb);
}

}
//程序运行结果
/**
* before sup....
a is 40
b is 100
in sup....
aa is