Java 数组详解及示例代码

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); 
  
// print directly will print reference value 
System.out.println(intArray); 
// [I@7150bd4d 
  
System.out.println(intArrayString); 
// [1, 2, 3, 4, 5] 

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] 

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

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

// 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 

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)); 
System.out.println(set); 
//[d, e, b, c, a] 

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

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

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