电影类的另一个完整示例：

public class A {

    public static void main(String[] args) {

        class Movie {

            String movieName;
            String genre;
            String movieType;
            String year;
            String ageRating;
            String rating;

            public Movie(String [] str)
            {
                this.movieName = str[0];
                this.genre = str[1];
                this.movieType = str[2];
                this.year = str[3];
                this.ageRating = str[4];
                this.rating = str[5];
            }
        }

        String [] movieDetailArr = {"Inception", "Thriller", "MovieType", "2010", "13+", "10/10"};

        Movie mv = new Movie(movieDetailArr);

        System.out.println("Movie Name: "+ mv.movieName);
        System.out.println("Movie genre: "+ mv.genre);
        System.out.println("Movie type: "+ mv.movieType);
        System.out.println("Movie year: "+ mv.year);
        System.out.println("Movie age : "+ mv.ageRating);
        System.out.println("Movie  rating: "+ mv.rating);
    }
}

您可以使用数组声明或数组文字（但仅当您立即声明并影响变量时，数组文字不能用于重新分配数组）。

对于基本类型：

int[] myIntArray = new int[3]; // each element of the array is initialised to 0
int[] myIntArray = {1, 2, 3};
int[] myIntArray = new int[]{1, 2, 3};

// Since Java 8. Doc of IntStream: https://docs.oracle.com/javase/8/docs/api/java/util/stream/IntStream.html

int [] myIntArray = IntStream.range(0, 100).toArray(); // From 0 to 99
int [] myIntArray = IntStream.rangeClosed(0, 100).toArray(); // From 0 to 100
int [] myIntArray = IntStream.of(12,25,36,85,28,96,47).toArray(); // The order is preserved.
int [] myIntArray = IntStream.of(12,25,36,85,28,96,47).sorted().toArray(); // Sort 

对于类，例如String，它是相同的：

String[] myStringArray = new String[3]; // each element is initialised to null
String[] myStringArray = {"a", "b", "c"};
String[] myStringArray = new String[]{"a", "b", "c"};

当您首先声明一个数组，然后初始化它，将一个数组作为函数参数传递，或者返回一个数组时，第三种初始化方法非常有用。需要显式类型。

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

电影类的另一个完整示例：

public class A {

    public static void main(String[] args) {

        class Movie {

            String movieName;
            String genre;
            String movieType;
            String year;
            String ageRating;
            String rating;

            public Movie(String [] str)
            {
                this.movieName = str[0];
                this.genre = str[1];
                this.movieType = str[2];
                this.year = str[3];
                this.ageRating = str[4];
                this.rating = str[5];
            }
        }

        String [] movieDetailArr = {"Inception", "Thriller", "MovieType", "2010", "13+", "10/10"};

        Movie mv = new Movie(movieDetailArr);

        System.out.println("Movie Name: "+ mv.movieName);
        System.out.println("Movie genre: "+ mv.genre);
        System.out.println("Movie type: "+ mv.movieType);
        System.out.println("Movie year: "+ mv.year);
        System.out.println("Movie age : "+ mv.ageRating);
        System.out.println("Movie  rating: "+ mv.rating);
    }
}

有两种类型的阵列。

一维阵列

默认值的语法：

int[] num = new int[5];

或（不太优选）

int num[] = new int[5];

给定值的语法（变量/字段初始化）：

int[] num = {1,2,3,4,5};

或（不太优选）

int num[] = {1, 2, 3, 4, 5};

注意：为了方便起见，最好使用int[]num，因为它清楚地告诉您在这里讨论的是数组。否则没有区别。一点也不。

多维数组

公告

int[][] num = new int[5][2];

Or

int num[][] = new int[5][2];

Or

int[] num[] = new int[5][2];

初始化

 num[0][0]=1;
 num[0][1]=2;
 num[1][0]=1;
 num[1][1]=2;
 num[2][0]=1;
 num[2][1]=2;
 num[3][0]=1;
 num[3][1]=2;
 num[4][0]=1;
 num[4][1]=2;

Or

 int[][] num={ {1,2}, {1,2}, {1,2}, {1,2}, {1,2} };

杂乱阵列（或非矩形阵列）

 int[][] num = new int[5][];
 num[0] = new int[1];
 num[1] = new int[5];
 num[2] = new int[2];
 num[3] = new int[3];

所以这里我们是显式定义列。另一种方式：

int[][] num={ {1}, {1,2}, {1,2,3,4,5}, {1,2}, {1,2,3} };

用于访问：

for (int i=0; i<(num.length); i++ ) {
    for (int j=0;j<num[i].length;j++)
        System.out.println(num[i][j]);
}

或者：

for (int[] a : num) {
  for (int i : a) {
    System.out.println(i);
  }
}

杂乱数组是多维数组。有关说明，请参阅官方java教程中的多维数组详细信息

声明数组：int[]arr；

初始化数组：int[]arr=new int[10]；10表示数组中允许的元素数

声明多维数组：int[][]arr；

初始化多维数组：int[][]arr=new int[10][17]；10行17列和170个元素，因为10乘以17等于170。

初始化数组意味着指定数组的大小。

为Java 8和更高版本声明和初始化。创建一个简单的整数数组：

int [] a1 = IntStream.range(1, 20).toArray();
System.out.println(Arrays.toString(a1));
// Output: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19]

为[-50，50]之间的整数和双[0，1E17]创建随机数组：

int [] a2 = new Random().ints(15, -50, 50).toArray();
double [] a3 = new Random().doubles(5, 0, 1e17).toArray();

两个序列的功率：

double [] a4 = LongStream.range(0, 7).mapToDouble(i -> Math.pow(2, i)).toArray();
System.out.println(Arrays.toString(a4));
// Output: [1.0, 2.0, 4.0, 8.0, 16.0, 32.0, 64.0]

对于String[]，必须指定构造函数：

String [] a5 = Stream.generate(()->"I will not squeak chalk").limit(5).toArray(String[]::new);
System.out.println(Arrays.toString(a5));

多维数组：

String [][] a6 = List.of(new String[]{"a", "b", "c"} , new String[]{"d", "e", "f", "g"})
    .toArray(new String[0][]);
System.out.println(Arrays.deepToString(a6));
// Output: [[a, b, c], [d, e, f, g]]