1.2 实验练习

1.2.1 一个简单的应用程序

public class Hello{public static void main(String args[]){System.out.println("你好，很高兴学习 Java");A a=new A();a.fA();}}class A{void fA(){System.out.println("We are students");}}

1.2.2 源文件的命名规则

public class People{int height;void speak(){System.out.printf("我身高是：%d",height);}}class A{public static void main(String args[]){People zhubajie;zhubajie=new People();zhubajie.height=170;System.out.println("zhubajie.height");System.out.println("主类不一定是public类");zhubajie.speak();}}