修改项目目录

src/chapter3/Example01.java

@@ -0,0 +1,37 @@
+package chapter3;
+
+class Student {
+    String name;
+    int age;
+    String sex;
+
+    void read() {
+        System.out.println("大家好，我是" + name + "，我在看书！");
+    }
+
+    void introduce() {
+        System.out.println("大家好，我叫" + name + "，我今年" + age + "岁了，我是" + sex + "孩");
+    }
+}
+
+public class Example01 {
+    public static void main(String[] args) {
+        Student s1 = new Student();
+        Student s2 = new Student();
+
+        s1.name = "小明";
+        s1.sex = "男";
+        s1.age = 20;
+
+
+        s2.name = "小红";
+        s2.sex = "女";
+        s2.age = 19;
+
+        s1.read();
+        s2.read();
+
+        s1.introduce();
+        s2.introduce();
+    }
+}