java public class Variables { public static void main(String[] args) { int age = 25; // 整数类型变量 double height = 170.5; // 浮点数类型变量 String name = "John"; // 字符串类型变量 System.out.println("Age: " + age); System.out.println("Height: " + height); System.out.println("Name: " + name); } }