增加java代码，提交TwoSum.java

Author: 曾林西

.gitignore

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+*~
+.classpath
+.idea
+.project
+.settings
+build/
+bin/
+out/
+*.ipr
+*.iml
+*.iws
+*.iml
+*.ipr
+*.iws
+*.tmproj
+*~
+.DS_Store
+.classpath
+.generators
+.idea
+.project
+.settings
+**/target
+target
+build

java/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>meituan</groupId>
+    <artifactId>leetcode</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+
+</project>

java/src/main/java/TwoSum.java

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+import java.util.HashMap;
+
+/**
+ * Created by zenglinxi on 15-8-1.
+ */
+public class TwoSum {
+  public int[] twoSum(int[] nums, int target) {
+    HashMap<Integer, Integer> hm = new HashMap<Integer, Integer>();
+    int[] result = new int[2];
+
+    for(int i = 0; i < nums.length; i++){
+      int one = nums[i];
+      int two = target - one;
+      if(hm.containsKey(two) && hm.get(two) != i + 1){
+        result[0] = hm.get(two);
+        result[1] = i + 1;
+      } else {
+        hm.put(nums[i], i + 1);
+      }
+    }
+    return result;
+  }
+
+  public static void main(String[] args){
+    TwoSum ts = new TwoSum();
+    int[] nums = {0, 4, 3, 0};
+    int target = 0;
+    int[] result = ts.twoSum(nums, target);
+    for(int num : result){
+      System.out.println(num);
+    }
+  }
+}