Java数组最常用的十个方法
jopen
10年前
翻译人员: 铁锚
翻译日期: 2013年11月19日
原文链接: Top 10 Methods for Java Arrays
以下是由 stackoverflow 网站 投票决出的Java数组最常用的十个方法,
0. 声明数组
String[] aArray = new String[5]; String[] bArray = {"a","b","c", "d", "e"}; String[] cArray = new String[]{"a","b","c","d","e"};1. 打印数组 int[] intArray = { 1, 2, 3, 4, 5 }; String intArrayString = Arrays.toString(intArray); // 直接打印,则会打印出引用对象的Hash值 // [I@7150bd4d System.out.println(intArray); // [1, 2, 3, 4, 5] System.out.println(intArrayString);2. 根据数组创建ArrayList 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);3. 检查数组是否包含某个值 String[] stringArray = { "a", "b", "c", "d", "e" }; boolean b = Arrays.asList(stringArray).contains("a"); // true System.out.println(b);4. 合并连接两个数组int[] intArray = { 1, 2, 3, 4, 5 }; int[] intArray2 = { 6, 7, 8, 9, 10 }; // Apache Commons Lang 库 int[] combinedIntArray = ArrayUtils.addAll(intArray, intArray2);5. 声明内联数组method(new String[]{"a", "b", "c", "d", "e"});6. 用给定的字符串连结(join)数组// 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);7. 将ArrayList转换为数组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. 将数组转换为SetSet<String> set = new HashSet<String>(Arrays.asList(stringArray)); //[d, e, b, c, a] System.out.println(set);9. 数组元素反转
int[] intArray = { 1, 2, 3, 4, 5 }; ArrayUtils.reverse(intArray); //[5, 4, 3, 2, 1] System.out.println(Arrays.toString(intArray));10. 移除元素int[] intArray = { 1, 2, 3, 4, 5 }; int[] removed = ArrayUtils.removeElement(intArray, 3);//创建新的数组 System.out.println(Arrays.toString(removed));更多——转换int值为字节数组byte[] bytes = ByteBuffer.allocate(4).putInt(8).array(); for (byte t : bytes) { System.out.format("0x%x ", t); }相关阅读: