变量声明和初始化

public class VarDemo {

 

public static void main(String[] args) {

// TODO Auto-generated method stub

int age; //声明，定义

age =16; //初始化

age =15;//赋值

System.out.println(age); //输出15

int core = 100;

core = 200;

System.out.println(core);

if(core>100){

int iq = 80; //作用域，只在if函数快内可以使用，跳出范围则无效

System.out.println(iq);

}

int iq =100;

System.out.println(iq);

}

 

}