任务的要求是应用赋值运算符实现： three+=one==>40
然后我看教程写的：three+=one;
Sytem.out.println("three+=one==>"+three);
我后面这段搞不明白，three+=one==>+three会变成three+=one=40的。这个40是怎么得出来的
根据第一步运算知道，three 的值是 30，而 one 的值是 10，前面几节的内容可以知道 three += one 是 three = three + one的简化表示，那么这时 three 的值就是 30 + 10，不就是 40 吗？不知道你是哪里没理解?
public class HelloWorld{
public static void main(String[] args) {
int one = 10 ;
int two = 20 ;
int three = 0 ;
System.out.println("three = one + two ==>"+ (three=one+two));
System.out.println("three += one ==>"+ (three+=one));
System.out.println("three -= one ==>"+ (three-=one));
System.out.println("three *= one ==>"+ (three*=one));
System.out.println("three /= one ==>"+ (three/=one));
System.out.println("three %= one ==>"+ (three%=one));
}
}