public class VarObject {

int globalVarInt; // 全局变量

char globalVarChar; // 全局

byte globalVarByte; // 全局

long globalVarLong; // 全局

short globalVarShort; // 全局

float globalVarFloat; // 全局

double globalVarDouble; // 全局

boolean globalVarBoolean; // 全局

/**

* 装箱

*/

private void function2() {

Character ch = 'c';

Integer i = 12;

Byte b = 12;

Short s = 123;

Long aLong = 123213L;

System.out.println("Character ch = " + ch);

System.out.println("Integer i = " + i);

System.out.println("Byte b = " + b);

System.out.println("Short s = " + s);

System.out.println("Long aLong = " + aLong);

// 手动装箱

Integer integer0 = new Integer(12);

System.out.println("Integer integer0 = " + integer0);

}

/**

* 拆箱

*/

private void function3() {

Integer i = new Integer(16);

int i2 = i;

int i3 = i.intValue(); // 不知道这个算不算手动拆箱

System.out.println("int i2 = " + i2);

System.out.println("int i3 = " + i3);

}

public void function() {

int localVarInt = 1; // 局部变量，必须初始化，否则会报编译错误

System.out.println(localVarInt);

System.out.println("全局变量globalVarInt的初始值：" + globalVarInt);

System.out.println("全局变量globalVarChar的初始值：" + globalVarChar);

System.out.println("全局变量globalVarByte的初始值：" + globalVarByte);

System.out.println("全局变量globalVarLong的初始值：" + globalVarLong);

System.out.println("全局变量globalVarShort的初始值：" + globalVarShort);

System.out.println("全局变量globalVarFloat的初始值：" + globalVarFloat);

System.out.println("全局变量globalVarDouble的初始值：" + globalVarDouble);

System.out.println("全局变量globalVarBoolean的初始值：" + globalVarBoolean);

}

public static void main(String[] args) {

new VarObject().function2();

}

}