为什么删掉第六行three=one+two；以后不能正常显示结果？
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=three+one==>"+three);
three-=one;
System.out.println("three=three-one==>"+three);
three*=one;
System.out.println("three=three*one==>"+three);
three/=one;
System.out.println("three=three=three/one==>"+three);
three%=one;
System.out.println("three=three%one==>"+three);
