增加过滤器模式 ○( ＾皿＾)っHiahiahia…○( ＾皿＾)っHiahiahia…

src/com/pattern/FilterPattern/materials/FilterMain.java

 package com.pattern.FilterPattern.materials;
 
+import com.pattern.FilterPattern.materials.filter.Filter;
+import com.pattern.FilterPattern.materials.filter.PaperFilter;
+import com.pattern.FilterPattern.materials.po.JunkDTO;
+
+import java.util.ArrayList;
+import java.util.List;
+
 /**
  * 过滤器模式
  *
@@ -7,7 +14,23 @@ package com.pattern.FilterPattern.materials;
  * @date 2021/11/25 13:56
  **/
 public class FilterMain {
-    public static void main(String[] args) {
 
+    public void main() {
+        // 我是收破烂的小老头，带着老头帽，今天不开心，只收纸箱子，其他的都不要
+        // 第一个顾客出现了，他有这些破烂准备卖给我：
+        List<JunkDTO> junks = new ArrayList<>();
+        JunkDTO wpJunk = new JunkDTO("瓦片",10D);
+        JunkDTO jtJunk = new JunkDTO("金条",100.02D);
+        junks.add(wpJunk);
+        junks.add(jtJunk);
+        // 我去挑一挑
+        Filter f = new PaperFilter();
+        junks = f.f(junks);
+        if(junks == null || junks.size() <= 0){
+            System.out.println("啥也不是，穷酸");
+        }else{
+            System.out.println("发财啦发财啦");
+        }
     }
+
 }

src/com/pattern/FilterPattern/materials/filter/Filter.java

+package com.pattern.FilterPattern.materials.filter;
+
+import com.pattern.FilterPattern.materials.po.JunkDTO;
+
+import java.util.List;
+
+/**
+ * 过滤接口
+ *
+ * @author lx
+ */
+public interface Filter {
+    /**
+     * 纸箱子破烂
+     */
+    String PAPER = "paper";
+    /**
+     * 塑料制品破烂
+     */
+    String PLASTICS = "plastics";
+
+    /**
+     * 过滤
+     *
+     * @param junks 破烂列表
+     * @return 想要的破烂列表
+     */
+    List<JunkDTO> f(List<JunkDTO> junks);
+}

src/com/pattern/FilterPattern/materials/filter/PaperFilter.java

+package com.pattern.FilterPattern.materials.filter;
+
+import com.pattern.FilterPattern.materials.po.JunkDTO;
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+/**
+ * 纸箱子过滤
+ *
+ * @author lx
+ * @date 2021/11/25 14:03
+ **/
+public class PaperFilter implements Filter {
+    /**
+     * 过滤
+     *
+     * @param junks 破烂列表
+     * @return 想要的破烂列表
+     */
+    @Override
+    public List<JunkDTO> f(List<JunkDTO> junks) {
+        return junks
+                .parallelStream()
+                .filter(f -> PAPER.equals(f.getName()))
+                .collect(Collectors.toList());
+    }
+}

src/com/pattern/FilterPattern/materials/po/JunkDTO.java

+package com.pattern.FilterPattern.materials.po;
+
+/**
+ * 破烂
+ *
+ * @author lx
+ * @date 2021/11/25 13:59
+ **/
+public class JunkDTO {
+    /**
+     * 破烂名字
+     */
+    private String name;
+    /**
+     * 破烂重量  斤
+     */
+    private Double weight;
+
+    public JunkDTO(String name, Double weight) {
+        this.name = name;
+        this.weight = weight;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public Double getWeight() {
+        return weight;
+    }
+
+    public void setWeight(Double weight) {
+        this.weight = weight;
+    }
+
+    @Override
+    public String toString() {
+        return "JunkDTO{" +
+                "name='" + name + '\'' +
+                ", weight=" + weight +
+                '}';
+    }
+}