Integer(-127-128之间)相关

package com.company.project.builder;

public class IntegerDemo1 {

public static void main(String[] args) {
Integer a = 120,b = 160;
Integer c = 120,d = 160;
System.out.println(a==c);//true
System.out.println(a.equals(c));//true
System.out.println(b==d);//false，解释：java底层的原因，如果-127-128之间，内存共用；如果不在这个范围，新建Integer对象
System.out.println(b.equals(d));//true
}

}