Java是一种面向对象的编程语言,具有跨平台性,在软件开发中应用极为广泛,我们都知道Array(数组)通常意义上讲只是一个单纯的线性序列,又基于Native,凭此它的效率历来便号称Java中?高。所以通常我们也都承认Java中效率?高的存储方式就是使用数组。在这里西安尚学堂小编给大家简单的分析Java中Array的几个简单的使用方法。
1.创建/声明一个数组
String[] aArray = new String[5]; String[] bArray = {"a","b","c", "d", "e"}; String[] cArray = new String[]{"a","b","c","d","e"};
2.Java中打印数组
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]
3.用数组创建一个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]
4.检查数组中是否包含特定的值
String[] stringArray = { "a", "b", "c", "d", "e" }; boolean b = Arrays.asList(stringArray).contains("a"); System.out.println(b);
5.结合两个数组
int[] intArray = { 1, 2, 3, 4, 5 }; int[] intArray2 = { 6, 7, 8, 9, 10 }; // Apache Commons Lang library int[] combinedIntArray = ArrayUtils.addAll(intArray, intArray2);
6.声明一个数组的方法
method(new String[]{"a", "b", "c", "d", "e"});
7.加入所提供的数组中的元素连接成一个字符串
// 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
8. Array与List之间的转换
String[] stringArray = { "a", "b", "c", "d", "e" }; ArrayList arrayList = new ArrayList(Arrays.asList(stringArray)); String[] stringArr = new String[arrayList.size()]; arrayList.toArray(stringArr); for (String s : stringArr) System.out.println(s);
9.数组转换成set
Set set = new HashSet(Arrays.asList(stringArray)); System.out.println(set); //[d, e, b, c, a]
10.数组反向输出
int[] intArray = { 1, 2, 3, 4, 5 }; ArrayUtils.reverse(intArray); System.out.println(Arrays.toString(intArray)); //[5, 4, 3, 2, 1]
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