java中的數組

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1,數組的定義

String[] a = new String[5];//定義數組的長度，稱為動態定義。

//下面兩種是在分配空間的同時還初始化了值

String[] b = new String[]{"a","b","c","d","e"};

String[] c = {"a","b","c","d","e"};

2.數組的輸出

String[] array = {"a","b","c","d","e"};

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

3.轉換數組為ArrayList

String[] array = {"a","b","c","d","e"};

ArrayList<String> arrayList = new ArrayList<String>(Arrays.asList(array));

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

4.檢查數組中是否包含某些值

String[] array = {"a","b","c","d","e"};

System.out.println(Arrars,asList(array).contains("c"));//true


5.數組的排序

用到了Arrays.sort()方法，下面是幾種用法

1）Arrays.sort(int[] array)//這樣是對數組中所有元素按照從小到大的順序排列

2）Arrays.sort(int[] a, int fromIndex, int toIndex)//這種是對數組從fromIndea到toIndex的位置按照從小到大的順序排列（下標為toIndex的不參與排序）

3）Arrays.sort(T[] a,Comparator<T> c)//根據制定的比較子的順序對a數組進行排序

 

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java中的數組