package com.oop.Demo11;
public class Demo02 {
public static void main(String[] args) {
//面试题
Integer integer1 = new Integer (100);
Integer integer2 = new Integer (100);
System.out.println (integer1==integer2);//false 此时比的是栈中integer1和integer2的地址
//Integer integer3=100; //自动装箱
Integer integer3=Integer.valueOf (100);
//Integer integer3=100; 自动装箱操作Integer integer3=Integer.valueOf (100);
//public static Integer valueOf(int i) {
// if (i >= IntegerCache.low && i <= IntegerCache.high)
// return IntegerCache.cache[i + (-IntegerCache.low)];
// return new Integer(i);
// }
//堆空间有一个Cache数组[-127~128],把这个数据的地址赋给integer3
//超出数据return new Integer(i);
//static final int low = -128;
//static final int high;
//int h = 127;
//high = h;
Integer integer4=100;
System.out.println (integer3==integer4);
Integer integer5=200; //自动装箱
Integer integer6=200;
System.out.println (integer5==integer6);
}
}
//运行结果
false
true
false
Process finished with exit code 0