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中星網(wǎng)絡(luò)支招系列:超實用的Java數(shù)組技巧攻略

 自由撰寫者 2013-09-17
本文分享了關(guān)于Java數(shù)組最頂級的11大方法,幫助你解決工作流程問題,無論是運用在團隊環(huán)境或是在私人項目中,你都可以直接拿來用! 

  0.  聲明一個數(shù)組(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"};

  1.  在Java中輸出一個數(shù)組(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]

  2. 從數(shù)組中創(chuàng)建數(shù)組列表(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]

  3. 檢查數(shù)組中是否包含特定值(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

  4. 連接兩個數(shù)組( 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);

  5. 聲明一個數(shù)組內(nèi)鏈(Declare an array inline )

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

  6. 將數(shù)組元素加入到一個獨立的字符串中(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

  7. 將數(shù)組列表轉(zhuǎn)換成一個數(shù)組 (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);

  8. 將數(shù)組轉(zhuǎn)換成一個集合(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]

  9. 反向數(shù)組(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]

  10. 刪除數(shù)組元素(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));

  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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