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

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publicclassHello{intf(){return"helloword";}publicstaticvoidmain(String[]args){Helloa=newHello();intx

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);
}
}