From a86d75705344a9c9a375be52d00d3abf226d9ca9 Mon Sep 17 00:00:00 2001
From: seahi <me@seahi.me>
Date: Wed, 6 Nov 2024 13:16:49 +0800
Subject: [PATCH] =?UTF-8?q?=E6=97=A0=E5=85=B3=E7=B4=A7=E8=A6=81?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 src/chapter4/Example25.java           | 12 ++++++++-
 src/chapter4/example14/Example14.java | 36 ++++++++++++++++++++++++++-
 src/chapter4/object/Test.java         | 14 ++++++++---
 3 files changed, 57 insertions(+), 5 deletions(-)

diff --git a/src/chapter4/Example25.java b/src/chapter4/Example25.java
index 4cb7715..c64d2a1 100644
--- a/src/chapter4/Example25.java
+++ b/src/chapter4/Example25.java
@@ -1,4 +1,14 @@
 package chapter4;
 
-public class Examaple25 {
+public class Example25 {
+    public static void main(String[] args) {
+        int result = divide(4, 0);
+        System.out.println("结果：" + result);
+
+        System.out.println("程序继续运行...");
+    }
+
+    public static int divide(int x, int y) {
+        return x / y;
+    }
 }
diff --git a/src/chapter4/example14/Example14.java b/src/chapter4/example14/Example14.java
index f36780a..2dfac1b 100644
--- a/src/chapter4/example14/Example14.java
+++ b/src/chapter4/example14/Example14.java
@@ -1,2 +1,36 @@
-package chapter4.example14;public class Example14 {
+package chapter4.example14;
+
+abstract class Animal {
+    abstract void shout();
+}
+
+class Cat extends Animal {
+    public void shout() {
+        System.out.println("喵喵...");
+    }
+}
+
+class Dog extends Animal {
+    public void shout() {
+        System.out.println("汪汪...");
+    }
+}
+
+class Example14 {
+    public static void main(String[] args) {
+        Animal cat = new Cat();
+        Animal dog = new Dog();
+
+        cat.shout();
+        dog.shout();
+    }
+}
+
+class Example15 {
+    public static void main(String[] args) {
+        Dog dog = new Dog();
+        Animal an = dog;
+
+        an.shout();
+    }
 }
diff --git a/src/chapter4/object/Test.java b/src/chapter4/object/Test.java
index 6a392a8..d3f921e 100644
--- a/src/chapter4/object/Test.java
+++ b/src/chapter4/object/Test.java
@@ -1,5 +1,7 @@
 package chapter4.object;
 
+import java.util.HashSet;
+
 class Student {
     private String name;
     private int age;
@@ -9,11 +11,17 @@ class Student {
         this.age = age;
     }
 
-    public String toString() {
-        return "Student {name=" + name + ", age=" + age + "}";
-    }
+//    public String toString() {
+//        return "Student {name=" + name + ", age=" + age + "}";
+//    }
 }
 
 public class Test {
+    public static void main(String[] args) {
+        Student s1 = new Student("张三", 23);
 
+        System.out.println(s1);
+
+
+    }
 }
\ No newline at end of file