feat(class17): 基本继承

- 新增 People 类，包含姓名和性别属性- 新增 Consultant 类和 Teacher 类，继承自 People 类
- 添加 Test 类用于测试 Teacher 类的功能

src/class17/Consultant.java

@@ -0,0 +1,13 @@
+package class17;
+
+public class Consultant extends  People{
+    private int number;
+
+    public int getNumber() {
+        return number;
+    }
+
+    public void setNumber(int number) {
+        this.number = number;
+    }
+}

src/class17/People.java

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+package class17;
+
+public class People {
+    private String name;
+    private char sex;
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public char getSex() {
+        return sex;
+    }
+
+    public void setSex(char sex) {
+        this.sex = sex;
+    }
+}

src/class17/Teacher.java

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+package class17;
+
+public class Teacher extends  People{
+    private String skill;
+
+    public String getSkill() {
+        return skill;
+    }
+
+    public void setSkill(String skill) {
+        this.skill = skill;
+    }
+}

src/class17/Test.java

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+package class17;
+
+public class Test {
+    public static void main(String[] args) {
+        Teacher t = new Teacher();
+        t.setName("dlei");
+        t.setSkill("java、前端、大数据");
+        t.setSex('男');
+        System.out.println(t.getName());
+        System.out.println(t.getSkill());
+        System.out.println(t.getSex());
+
+        Consultant c = new Consultant();
+        c.setName("dlei");
+        c.setSex('男');
+        c.setNumber(1001);
+        System.out.println(c.getName());
+        System.out.println(c.getSex());
+        System.out.println(c.getNumber());
+
+    }
+}