java文件不在当前文件夹的路径下，这是为啥？

Question

源代码如下：
public class Test {
public static void main(String[] args){
Son s=new Son();
s.show();
}
}
public class Father{
public int age=50;
}
public class Son extends Father{
public int age=19;
public void show(){
int age=39;
System.out.println(age);
System.out.println(this.age);
System.out.println(super.age);
}
}
问题如下：
Father.java is not on the classpath of project java源代码字节码文件夹_4af54545, only syntax errors are reported
Son.java is not on the classpath of project java源代码字节码文件夹_4af54545, only syntax errors are reported
Test.java is not on the classpath of project java源代码字节码文件夹_4af54545, only syntax errors are reported
请问如何解决？

Answer 1

如果你是用cmd运行的，那要先进去.java文件的上一级目录