每天JAVA简单教学：基本运算符

今天来介绍一些基础运算符，先用int整数类型做介绍，最后用String字符串做介绍:

package operator;

public class Operator {
	public static void main(String[] args)
	{
		int a,b,c,d;
		//赋值
		a = 0;
		//两边类型要一致，否则要进行类型强转，如果转换失败会抛出异常
		b = (int)1L;
		//相加
		c = a + b;			//c = 1
		//相乘
		d = b * a;			//d = 1
		System.out.printf("a=%d,b=%d,c=%d,d=%d\n",a,b,c,d);
		//等价于a = a + 1
		a += 1;				//a = 1
		//等价于 b = b * 2
		b *= 2;				//b = 2
		//等价于 d = d + 1
		d ++;				//d = 1
		//往左移4位
		c = c << 4;			//c = 16
		System.out.printf("a=%d,b=%d,c=%d,d=%d\n",a,b,c,d);
		//()运算符
		d = (a+b) * c;		//d = 48		
		/*
		 * 与运算
		 * d = 48 --> 110000
		 * c = 16 -->  10000 
		 */
		a = d & c;			//a =  16 --> 010000
		/*
		 *或运算
		 * d = 48 --> 110000
		 * 3      -->     11
		 */
		b = d | 3;			//b = 51  --> 110011
		/*
		 * 异或运算
		 * d = 48 --> 110000
		 * 17     --> 010001
		 */
		a = d ^ 17;			//a = 33 --> 100001
		System.out.printf("a=%d,b=%d,c=%d,d=%d\n",a,b,c,d);
		//求余
		d = d % 6;			//d = 6
		System.out.println("d="+d);
		
		//字符串相加
		System.out.println("Hello "+ "World");
	}
}

因为时间有限，可能有不全面的地方，如果有漏掉的劳烦帮忙补充下，谢谢。