来源：http://www.imooc.com/code/1298
赋值运算符是指为变量或常量指定数值的符号。如可以使用 “=” 将右边的表达式结果赋给左边的操作数。
Java 支持的常用赋值运算符，如下表所示：
任务
让我们赶紧来做个练习吧，亲...
请在编辑器中，空白处编写代码，应用赋值运算符实现如下结果：
public class HelloWorld{
public static void main(String[] args) {
int one = 10 ;
int two = 20 ;
int three = 0 ;
three = one + two;
System.out.println("three = one + two ==> "+three);
three += one;
System.out.println("three += one ==> "+three);
three -= one;
System.out.println("three -= one ==> "+three);
three *= one;
System.out.println("three *= one ==> "+three);
three /= one;
System.out.println("three /= one ==> "+three);
three %= one;
System.out.println("three %= one ==> "+three);
}
}