package cn.itcast;
/*
* java虚拟机为了优化8种基本数据类型的包装对象都提供了缓冲池,缓冲池有大小,一个字节。
*/
public class Demo {
public static void main(String[] args) {
Integer i1 = new Integer(127);
Integer i2 = new Integer(127);
System.out.println(i1 == i2);
Integer i3 = new Integer(128);
Integer i4 = new Integer(128);
System.out.println(i3 == i4);
Integer i5 = 128;
Integer i6 = 128;
System.out.println(i5 == i6);
Integer i7 = -127;
Integer i8 = -127;
System.out.println(i7 == i8);
//1byte = -128~127
}
} |