Java數(shù)組的十大方法
以下是Java Array的前10種方法。他們是來自stackoverflow的投票最多的問題。

• 0.聲明一個(gè)數(shù)組

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

• 1.用Java打印數(shù)組

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)建一個(gè)ArrayList

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)組是否包含某個(gè)值

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

• 4.連接兩個(gè)數(shù)組

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.內(nèi)聯(lián)聲明一個(gè)數(shù)組

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

• 6.將提供的數(shù)組的元素連接成單個(gè)字符串

// 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ArrayList包含到數(shù)組中

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)換為集合

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

• 9.反轉(zhuǎn)一個(gè)數(shù)組

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)組的元素

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

• 再多一個(gè) - 將int轉(zhuǎn)換為字節(jié)數(shù)組

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

轉(zhuǎn)：https://www.programcreek.com/2013/09/top-10-methods-for-java-arrays/

轉(zhuǎn)載于:https://www.cnblogs.com/hglibin/p/9001876.html

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