首先看一下这段代码
Integer i1 = 100;
Integer i2 = 100;
if (i1==i2) {
System.out.println("i1==i2");
} else {
System.out.println("i1!=i2");
}
Integer i3 = 200;
Integer i4 = 200;
System.out.println(i3);
System.out.println(i4);
if (i3==i4) {
System.out.println("i3==i4");
} else {
System.out.println("i3!=i4");
}
结果是：i1=i2
i3!=i4
再看下面代码
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