Array

int[] anArray;
anArray = new int[10];


anArray[0] = 100;
anArray[1] = 200;
anArray[2] = 300;
anArray[3] = 400;
anArray[4] = 500;
anArray[5] = 600;
anArray[6] = 700;
anArray[7] = 800;
anArray[8] = 900;
anArray[9] = 1000;

int[] anArray = { 
    100, 200, 300,
    400, 500, 600, 
    700, 800, 900, 1000
};

the rows are allowed to vary in length

String[][] names = {
            {"Mr. ", "Mrs. ", "Ms. "},
            {"Smith", "Jones"}
        };

length property is built-in.

System.out.println(anArray.length);

System.arraycopy()

public static void arraycopy(Object src, int srcPos,

                             Object dest, int destPos, int length)

class ArrayCopyDemo {
    public static void main(String[] args) {
        char[] copyFrom = { 'd', 'e', 'c', 'a', 'f', 'f', 'e',
       'i', 'n', 'a', 't', 'e', 'd' };
        char[] copyTo = new char[7];

        System.arraycopy(copyFrom, 2, copyTo, 0, 7);
        System.out.println(new String(copyTo));
    }
}

array can be converted to String easily.

new String(copyTo)

java.util.Arrays.copyOfRange

class ArrayCopyOfDemo {
    public static void main(String[] args) {
        
        char[] copyFrom = {'d', 'e', 'c', 'a', 'f', 'f', 'e',
                           'i', 'n', 'a', 't', 'e', 'd'};
            
        char[] copyTo = java.util.Arrays.copyOfRange(copyFrom, 2, 9);
        
        System.out.println(new String(copyTo));
    }
}

java.util.Arrays

      binarySearch()

      equals()

      fill()

      sort()

      parallelSort()