variable.java

Java面向对象编程(随书配套源代码) 阐述了面向对象编程的思想

package chapter3;

public class Variable
{
	public static void main(String[] args)
	{
		int a,b,c;
		int d=1,e=1+1;
		int f ="hello world!";
		
		double pi,r,area;
		pi = 3.1415926;
		r =  3;
		area = pi*r*r;
		System.out.println(area);
	}
}