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  • IntegerDemo4

    package cn.it;
    /*
     * integer面试题
     * 注意:
     *  Integer的数据直接赋值,如果在-128——127之间,会直接从缓冲池获取数据
     *  否则new一个值
     */
    public class IntegerDemo4 {
     public static void main(String[] args) {
      Integer i1 = new Integer(127);
      Integer i2 = new Integer(127);
      System.out.println(i1 == i2);
      System.out.println(i1.equals(i2));
      System.out.println("-------------------");
      Integer i3 = new Integer(128);
      Integer i4 = new Integer(128);
      System.out.println(i3 == i4);
      System.out.println(i3.equals(i4));
      System.out.println("-------------------");
      Integer i5 = 128;
      Integer i6 = 128;
      System.out.println(i5 == i6);
      System.out.println(i5.equals(i6));
      System.out.println("-------------------");
      Integer i7 = 127;
      Integer i8 = 127;
      System.out.println(i7 == i8);
      System.out.println(i7.equals(i8));
      //Integer ii = Integer.valueOf(100);
      //针对-128——127,做了一个数据缓冲池,如果数据在此范围内,则不会创建空间
     }
    }
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  • 原文地址:https://www.cnblogs.com/rong123/p/9894370.html
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