Java數組最常用的十個方法

翻譯人員: 鐵錨

翻譯日期: 2013年11月19日

原文鏈接: Top 10 Methods for Java Arrays

以下是由 stackoverflow 網站 投票決出的Java數組最常用的十個方法, 

0. 聲明數組

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

int[] intArray = { 1, 2, 3, 4, 5 };
String intArrayString = Arrays.toString(intArray);

// 直接打印,則會打印出引用對象的Hash值
// [I@7150bd4d
System.out.println(intArray);

// [1, 2, 3, 4, 5]
System.out.println(intArrayString);

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

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

int[] intArray = { 1, 2, 3, 4, 5 };
int[] intArray2 = { 6, 7, 8, 9, 10 };
// Apache Commons Lang 庫
int[] combinedIntArray = ArrayUtils.addAll(intArray, intArray2);

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

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

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);

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

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

int[] intArray = { 1, 2, 3, 4, 5 };
int[] removed = ArrayUtils.removeElement(intArray, 3);//創建新的數組
System.out.println(Arrays.toString(removed));

byte[] bytes = ByteBuffer.allocate(4).putInt(8).array();

for (byte t : bytes) {
   System.out.format("0x%x ", t);
}

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