合并远程并上传excption

excption/Repoditory.java

@@ -0,0 +1,19 @@
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class ArticleRepository {
+    private static final Logger log = LoggerFactory.getLogger(ArticleRepository.class);
+
+    public void save(Article article) {
+        // 防御检查：空值拦截
+        if (article == null) {
+            log.warn("保存文章失败：article为空");
+            return;
+        }
+        if (article.getTitle() == null || article.getTitle().isBlank()) {
+            log.warn("保存文章失败：标题为空");
+            return;
+        }
+        // 原有保存逻辑
+    }
+}

excption/excption.java

@@ -0,0 +1,7 @@
+package exception;
+
+public class ParseException extends CrawlerException {
+    public ParseException(String message) {
+        super(message);
+    }
+}

w4/面积计算器代码.java

@@ -0,0 +1,42 @@
+abstract class Area{
+    public abstract double draw();
+}
+class circle extends Area{
+    double r;
+    public double draw() {
+        double area = 3.14 * r * r;
+        System.out.println(area);
+        return area;
+    }
+}
+class rectangle extends Area{
+    double l,b;
+    public double draw() {
+        double area = l * b;
+        System.out.println(area);
+        return area;
+    }
+}
+class tangle extends Area{
+    double b,h;
+    public double draw() {
+        double area = 0.5 * b * h;
+        System.out.println(area);
+        return area;
+    }
+}
+public class Main{
+    static void main(String[] args) {
+        circle c=new circle();
+        c.r=5;
+        c.draw();
+        rectangle a=new rectangle();
+        a.l=5;
+        a.b=4;
+        a.draw();
+        tangle t=new tangle();
+        t.b=5;
+        t.h=4;
+        t.draw();
+    }
+}

w6

@@ -0,0 +1 @@
+Subproject commit 3bc4b41f0b162e341fd0a8c30f1c4d34c7d6fc00

w8/集合键值转换.java

@@ -0,0 +1,23 @@
+public class Pair<K,V>{
+    private K key;
+    private V value;
+    public Pair(K key,V value){
+        this.key=key;
+        this.value=value;
+    }
+    public K getKey(){
+        return key;
+    }
+    public V getValue(){
+        return value;
+    }
+    public void setKey(K key){
+        this.key=key;
+    }
+    public void setValue(V value){
+        this.value=value;
+    }
+    public static <K,V> Pair<V,K> swap(Pair<K,V> pair){
+        return new Pair<>(pair.getValue(), pair.getKey());
+    }
+}