一個句子之中只能有一個=號

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);

????????three+=one;
????????System.out.println(three);

????????three-=one;
????????System.out.println(three);

????????three*=one;
????????System.out.println(three);

????????three/=one;
????????System.out.println(three);
????????
????????three%=one;
????????System.out.println(three);
????}
}

左面等于號算數運算符，右面是賦值運算符，題目的意思是讓你得到這些結果，不是讓你去賦值，three=one+two;

three此時的值已經是30了，達到題目要求，同理下面也是這樣，因此你可以在每一行后面都進行一次輸出，System.out.println(three);