标识符 AvA 标织→常量、变量、数据类型、类和方法 public class helloWorld1 i public static void main(stringl] argsi String message= Hello world! myPrint(message) private static void my Print(string st System. out. printIn(s);4 标识符 ◼ 标识→常量、变量、数据类型、类和方法 public class HelloWorld1 { public static void main(String[] args) { String message = “Hello World!”; myPrint(message); } private static void myPrint(String s) { System.out.println(s); } }