【装箱与拆箱】

拆箱：装箱：包装类自动装箱与自动拆箱==Intefer 缓存==8种数据类型对应的包装类

包装类对象-到–>基本数据类型的过程 称之为拆箱

 public class Wraper {
	public static void main(String[] args) {
Integer a = 10;
		int b = a;
		}
}

基本数据类型-到–>包装类对象的过程 称之为装箱

 public class Wraper {
	public static void main(String[] args) {
		int c = 20;
Integer d = c;
	}
}

JDK1.5之前是不支持自动装箱和自动拆箱的

 public class Wraper {
	public static void main(String[] args) {
Integer i = new Integer(8);
		}
}

JDK1.5开始，提供了自动装箱的功能

 public class Wraper {
	public static void main(String[] args) {
	Integer i = 8;
	int n = i;//自动拆箱
	}
}

 public class Wraper {
	public static void main(String[] args) {
		Integer e = 127;
		Integer f = 127;
		Integer h = 128;
		Integer i = 128;
		int aa = 127;
		int bb = 127;
		int cc = 128;
		int dd = 128;
		System.out.println(aa == bb);
		System.out.println(cc == dd);
		System.out.println(e == f);
		System.out.println(h == i);
		}
}

 true
true
true
false

 public class Wraper {
	public static void main(String[] args) {
Byte byte
Short short
Integer int
Long long
Double double
Float float
Character char
Boolean boolean
	}
}