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0. 声明一个数组(Declare an array)
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String[] aArray = new String[5];
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String[] bArray = {"a","b","c", "d", "e"};
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String[] cArray = new String[]{"a","b","c","d","e"};
1. 在Java中输出一个数组(Print an array in Java)
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int[] intArray = { 1, 2, 3, 4, 5 };
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String intArrayString = Arrays.toString(intArray);
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System.out.println(intArray);
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System.out.println(intArrayString);
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2. 从数组中创建数组列表(Create an ArrayList from an array)
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String[] stringArray = { "a", "b", "c", "d", "e" };
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ArrayList arrayList = new ArrayList(Arrays.asList(stringArray));
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System.out.println(arrayList);
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3. 检查数组中是否包含特定值(Check if an array contains a certain value)
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String[] stringArray = { "a", "b", "c", "d", "e" };
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boolean b = Arrays.asList(stringArray).contains("a");
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System.out.println(b);
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4. 连接两个数组( Concatenate two arrays)
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int[] intArray = { 1, 2, 3, 4, 5 };
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int[] intArray2 = { 6, 7, 8, 9, 10 };
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int[] combinedIntArray = ArrayUtils.addAll(intArray, intArray2);
5. 声明一个数组内链(Declare an array inline )
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method(new String[]{"a", "b", "c", "d", "e"});
6. 将数组元素加入到一个独立的字符串中(Joins the elements of the provided array into a single String)
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String j = StringUtils.join(new String[] { "a", "b", "c" }, ", ");
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System.out.println(j);
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7. 将数组列表转换成一个数组 (Covnert an ArrayList to an array)
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String[] stringArray = { "a", "b", "c", "d", "e" };
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ArrayList arrayList = new ArrayList(Arrays.asList(stringArray));
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String[] stringArr = new String[arrayList.size()];
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arrayList.toArray(stringArr);
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for (String s : stringArr)
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System.out.println(s);
8. 将数组转换成一个集合(Convert an array to a set)
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Set set = new HashSet(Arrays.asList(stringArray));
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System.out.println(set);
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9. 反向数组(Reverse an array)
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int[] intArray = { 1, 2, 3, 4, 5 };
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ArrayUtils.reverse(intArray);
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System.out.println(Arrays.toString(intArray));
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10. 删除数组元素(Remove element of an array)
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int[] intArray = { 1, 2, 3, 4, 5 };
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int[] removed = ArrayUtils.removeElement(intArray, 3);
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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();
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for (byte t : bytes) {
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System.out.format("0x%x ", t);
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}
英文出自: Programcreek
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