JAVA编程思想(第4版)测试对象的等价性

package test;

public class Test {
	
	public static void main(String args[])
	{
		Integer i1=new Integer(48);
		Integer i2=new Integer(48);
		System.out.println(i1==i2);
		System.out.println(i1!=i2);
	}
}package test;

public cl