public class Hello{ int f(){ return "hello word"; }

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public class Hello{ int f(){ return "hello word"; }
public static void main(String[] args){
Hello a = new Hello();
int x = a.f();
System.out.println("x = " + x);
}
}
程序哪错了

public class Hello {
public String f(){
return "hello word";
}
}
public static void main(String[] args){
Hello a = new Hello();
String x = a.f();
System.out.println("x = " + x);
}
}
public class Hello {
public int f(){
return 123;
}
}
public static void main(String[] args){
Hello a = new Hello();
int x = a.f();
System.out.println("x = " + x);
}
}

hello, Hello public class test(){ public Class a(int i) {} public static class,please stand up hello,class. class,please stand up.Hello,class Class,please stand up Hello,class #include class A { public: int n; }; class B:virtual public class Point{ protected int x,y; public Point(){} public Poin 请问for语句如何执行的,该怎么理解下面的循环?我要输出的是1 —9的乘法口诀?public class Hello{ hello hello 的英文歌. Hello,Lucy!Hello,Helen!... hello hello快慢版都要~