在jdk1.5以上的版本中，基本類型和封裝類能自動轉化，與String類型的對象和字符串常量類似。

Integer?i1?=?123;????????Integer?i2?=?123?????????int?i?=?123;??????????Integer?i3?=?new?Integer(123);????????Integer?i4?=?new?Integer(123);???????????????????????????????System.out.println("i1?==?i2?=?"+(i1?==?i2));????????System.out.println("i1.equals(i2)?=?"+(i1.equals(i2)));????????????????System.out.println();????????System.out.println("i3?==?i4?=?"+(i3?==?i4));????????System.out.println("i3.equals(i4)?=?"+(i3.equals(i4)));????????????????System.out.println();????????System.out.println("i2?==?i4?=?"+(i2?==?i4));????????System.out.println("i2.equals(i4)?=?"+(i2.equals(i4)));????????????????System.out.println();????????System.out.println("i?==?i2?=?"+(i?==?i2));????????System.out.println("i1.equals(i)?=?"+(i1.equals(i)));

System.out.println();????????System.out.println("i?==?i4?=?"+(i?==?i4));????????System.out.println("i4.equals(i)?=?"+(i4.equals(i)));

i1?==?i2?=?true??????i1.equals(i2)?=?true

i3?==?i4?=?false??????i3.equals(i4)?=?true

i2?==?i4?=?false??????i2.equals(i4)?=?true

i?==?i2?=?true??????i1.equals(i)?=?true

i?==?i4?=?true??????i4.equals(i)?=?true