java小白求助，在一个文件中写了一个public class文件如何应用到其他java文件中？java1：public class Overload1 { public static void main(String[] args) { Q.w(120); } } public class Q { public static void w(int b) { System.out.println(b); } public static void w(short b) { System.out.println(b); } public static void w(long b) { System.out.println(b); } public static void w(double b) { System.out.println(b); } public static void w(boolean b) { System.out.println(b); } public static void w(byte b) { System.out.println(b); } } java2：public class Q111 { public static void main(String[] args) { Q.w("Hello World!"); } } java1中的public class在写入java2时会弹出“找不到符号”