分析之前，先猜想一下看看下面code snippets的输出：
package cn.effine.test;
public class IntegerTest {
public static void main(String[] args) {
Integer i1 = 2;
Integer i2 = 2;
System.err.println("i1 == i2 : " + (i1 == i2));
Integer i3 = new Integer(2);
Integer i4 = new Integer(2);
System.err.println("i3 == i4: " + (i3 == i4));
Integer i5 = 128;
Integer i6 = 128;
System.err.println("i5 == i6 : " + (i5 == i6));
System.err.println("i5、i6的inValue()方法等值比较： " + (i5.intValue() == i6.intValue()));
System.err.println("i5、i6的equals的比较： " + i5.equals(i6));
}
}