set 唯一性 求并集

Andy · Andy · commit 7f29da41da6d · 2016-09-27T10:59:11.000+08:00
diff --git a/src/org/test/array/ArrayUnion.java b/src/org/test/array/ArrayUnion.java
@@ -0,0 +1,35 @@
+package org.test.array;
+
+import java.util.HashSet;
+import java.util.Set;
+
+/**
+ * @author Andy union ()方法来计算两个数组的并集
+ */
+public class ArrayUnion {
+	public static void main(String[] args) {
+
+		String[] arr1 = { "1", "2", "3" };
+		String[] arr2 = { "4", "5", "6" };
+		String[] result_union = union(arr1, arr2);
+		 System.out.println("并集的结果如下：");
+
+	        for (String str : result_union) {
+	            System.out.println(str);
+	        }
+	}
+	
+	public static String[] union(String[] arr1,String[]arr2){
+		Set<String> set = new HashSet<String>();
+		for(String str:arr1){
+			set.add(str);
+		}
+		
+		for(String str:arr2){
+			set.add(str);
+		}
+		
+		String [] result = {};
+		return set.toArray(result);
+	}
+}
