本文分享了关于Java数组最顶级的11大方法，帮助你解决工作流程问题，无论是运用在团队环境或是在私人项目中，你都可以直接拿来用！ 0.  声明一个数组（Declare an array）     


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• String[] aArray = new String[5];  
• String[] bArray = {"a","b","c", "d", "e"};  
• String[] cArray = new String[]{"a","b","c","d","e"};  
  

String[] aArray = new String[5];String[] bArray = {"a","b","c", "d", "e"};String[] cArray = new String[]{"a","b","c","d","e"};1.  在Java中输出一个数组（Print an array in Java）

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• int[] intArray = { 1, 2, 3, 4, 5 };  
• String intArrayString = Arrays.toString(intArray);  
•    
• // print directly will print reference value  
• System.out.println(intArray);  
• // [I@7150bd4d  
•    
• System.out.println(intArrayString);  
• // [1, 2, 3, 4, 5]  
  

int[] intArray = { 1, 2, 3, 4, 5 };String intArrayString = Arrays.toString(intArray); // print directly will print reference valueSystem.out.println(intArray);// [I@7150bd4d System.out.println(intArrayString);// [1, 2, 3, 4, 5]2. 从数组中创建数组列表（Create an ArrayList from an array）

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• String[] stringArray = { "a", "b", "c", "d", "e" };  
• ArrayList<String> arrayList = new ArrayList<String>(Arrays.asList(stringArray));  
• System.out.println(arrayList);  
• // [a, b, c, d, e]  
  

String[] stringArray = { "a", "b", "c", "d", "e" };ArrayList<String> arrayList = new ArrayList<String>(Arrays.asList(stringArray));System.out.println(arrayList);// [a, b, c, d, e]3. 检查数组中是否包含特定值（Check if an array contains a certain value）

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• String[] stringArray = { "a", "b", "c", "d", "e" };  
• boolean b = Arrays.asList(stringArray).contains("a");  
• System.out.println(b);  
• // true  
  

String[] stringArray = { "a", "b", "c", "d", "e" };boolean b = Arrays.asList(stringArray).contains("a");System.out.println(b);// true4. 连接两个数组（ Concatenate two arrays）
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• int[] intArray = { 1, 2, 3, 4, 5 };  
• int[] intArray2 = { 6, 7, 8, 9, 10 };  
• // Apache Commons Lang library  
• int[] combinedIntArray = ArrayUtils.addAll(intArray, intArray2);  
  

int[] intArray = { 1, 2, 3, 4, 5 };int[] intArray2 = { 6, 7, 8, 9, 10 };// Apache Commons Lang libraryint[] combinedIntArray = ArrayUtils.addAll(intArray, intArray2);5. 声明一个数组内链（Declare an array inline ）

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• method(new String[]{"a", "b", "c", "d", "e"});  
  

method(new String[]{"a", "b", "c", "d", "e"});6. 将数组元素加入到一个独立的字符串中（Joins the elements of the provided array into a single String）

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• // containing the provided list of elements  
• // Apache common lang  
• String j = StringUtils.join(new String[] { "a", "b", "c" }, ", ");  
• System.out.println(j);  
• // a, b, c  
  

// containing the provided list of elements// Apache common langString j = StringUtils.join(new String[] { "a", "b", "c" }, ", ");System.out.println(j);// a, b, c7. 将数组列表转换成一个数组 （Covnert an ArrayList to an array）

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• String[] stringArray = { "a", "b", "c", "d", "e" };  
• ArrayList<String> arrayList = new ArrayList<String>(Arrays.asList(stringArray));  
• String[] stringArr = new String[arrayList.size()];  
• arrayList.toArray(stringArr);  
• for (String s : stringArr)  
•     System.out.println(s);  
  

String[] stringArray = { "a", "b", "c", "d", "e" };ArrayList<String> arrayList = new ArrayList<String>(Arrays.asList(stringArray));String[] stringArr = new String[arrayList.size()];arrayList.toArray(stringArr);for (String s : stringArr)        System.out.println(s);8. 将数组转换成一个集合（Convert an array to a set）


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• Set<String> set = new HashSet<String>(Arrays.asList(stringArray));  
• System.out.println(set);  
• //[d, e, b, c, a]  
  

Set<String> set = new HashSet<String>(Arrays.asList(stringArray));System.out.println(set);//[d, e, b, c, a]9. 反向数组（Reverse an array）

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• int[] intArray = { 1, 2, 3, 4, 5 };  
• ArrayUtils.reverse(intArray);  
• System.out.println(Arrays.toString(intArray));  
• //[5, 4, 3, 2, 1]  
  

int[] intArray = { 1, 2, 3, 4, 5 };ArrayUtils.reverse(intArray);System.out.println(Arrays.toString(intArray));//[5, 4, 3, 2, 1]10. 删除数组元素（Remove element of an array）

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• int[] intArray = { 1, 2, 3, 4, 5 };  
• int[] removed = ArrayUtils.removeElement(intArray, 3);//create a new array  
• System.out.println(Arrays.toString(removed));  
  

int[] intArray = { 1, 2, 3, 4, 5 };int[] removed = ArrayUtils.removeElement(intArray, 3);//create a new arraySystem.out.println(Arrays.toString(removed));One more – convert int to byte array


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• byte[] bytes = ByteBuffer.allocate(4).putInt(8).array();  
•    
• for (byte t : bytes) {  
•    System.out.format("0x%x ", t);  
• }  
  

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