重捡JAVA，第一节 各类数据类型的定义

package example2;

public class Ex2_1 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		final double PI=3.14159; //定义double类型常量PI
		byte a;	//定义 byte类型变量a
		int b; 	//定义 int类型变量b
		char c; //定义 char类型变量c
		double d =2.5; //定义double类型变量d
		a = 012; //给变量a赋值 该值为八进制12.十进制10
		b = 100; //给变量b赋值100
		c = 'A'; //给变量c赋值'A'
		System.out.println(" PI= "+PI);
		System.out.println(" a= "+a);
		System.out.println(" b= "+b);
		System.out.println(" c= "+c);
		System.out.println(" d= "+d);
	}

}