Java 数组详解及示例代码
下面是stackoverflow中关于数组方法的相关问题中，获得最多票数的12个数组操作方法。
1. 声明一个数组
String[]aArray=newString[5];
String[]bArray={"a","b","c","d","e"};
String[]cArray=newString[]{"a","b","c","d","e"};
2. 输出一个数组
int[]intArray={1,2,3,4,5};
StringintArrayString=Arrays.toString(intArray);
//printdirectlywillprintreferencevalue
System.out.println(intArray);
//[I@7150bd4d
System.out.println(intArrayString);
//[1,2,3,4,5]
3. 从一个数组创建数组列表
String[]stringArray={"a","b","c","d","e"};
ArrayList<String>arrayList=newArrayList<String>(Arrays.asList(stringArray));
System.out.println(arrayList);
//[a,b,c,d,e]
4. 检查一个数组是否包含某个值
String[]stringArray={"a","b","c","d","e"};
booleanb=Arrays.asList(stringArray).contains("a");
System.out.println(b);
//true
5. 连接两个数组
int[]intArray={1,2,3,4,5};
int[]intArray2={6,7,8,9,10};
//ApacheCommonsLanglibrary
int[]combinedIntArray=ArrayUtils.addAll(intArray,intArray2);
6. 声明一个内联数组（Arrayinline）
method(newString[]{"a","b","c","d","e"});
7. 把提供的数组元素放入一个字符串
//containingtheprovidedlistofelements
//Apachecommonlang
Stringj=StringUtils.join(newString[]{"a","b","c"},",");
System.out.println(j);
//a,b,c
8. 将一个数组列表转换为数组
String[]stringArray={"a","b","c","d","e"};
ArrayList<String>arrayList=newArrayList<String>(Arrays.asList(stringArray));
String[]stringArr=newString[arrayList.size()];
arrayList.toArray(stringArr);
for(Strings:stringArr)
System.out.println(s);
9. 将一个数组转换为集（set）
Set<String>set=newHashSet<String>(Arrays.asList(stringArray)); System.out.println(set); //[d,e,b,c,a]
10. 逆向一个数组
int[]intArray={1,2,3,4,5};
ArrayUtils.reverse(intArray);
System.out.println(Arrays.toString(intArray));
//[5,4,3,2,1]
11. 移除数组中的元素
int[]intArray={1,2,3,4,5};
int[]removed=ArrayUtils.removeElement(intArray,3);//createanewarray
System.out.println(Arrays.toString(removed));
12. 将整数转换为字节数组
byte[]bytes=ByteBuffer.allocate(4).putInt(8).array();
for(bytet:bytes){
System.out.format("0x%x",t);
}
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