Java defines several ways to define two-dimensional arrays

Defining a two-dimensional array notation 1

Class Numthree
{
public static void Main (string[] args)
{
Float[][] numthree;//defines a 2-dimensional array of type float
Numthree=new float[5][5];//allocates 5 rows and 5 columns of space

numthree[0][0]=1.1f;//through the subscript index to access 1 rows and 1 columns =1.1
numthree[1][0]=1.2f;//2 rows 1 Columns =1.2
numthree[2][0]=1.3f;//3 rows 1 Columns =1.3
numthree[3][0]=1.4f;//4 rows 1 Columns =1.4
numthree[4][0]=1.5f;//5 rows 1 Columns =1.5
System.out.println (Numthree[0][0]); Print line break output

}
}

Define a two-dimensional array to define the amount of space allocated at the same time as 2
Class Numfour
{
public static void Main (string[] args)
{
Short[][] Numfour=new short[5][8]; Defines an array of type short and assigns it a space size of 5 rows and 8 columns at the same time
numfour[0][7]=10;
numfour[1][6]=20;
numfour[2][5]=30;
numfour[3][4]=40;
numfour[4][3]=50;
}
}

//defines a two-dimensional array 3 irregular array
class numfive
{
     public static void Main (string[] args)
     {
               long[][] Numfive=new long[5][];//defines a long type of irregular array
                numfive[0]=new long[5];//Assign 5 columns to line 1th
                numfive[1]=new long[6];//Assign 6 columns to line 2nd
               numfive[2]=new long[7];// Assign 7 columns to line 3rd
               numfive[3]=new long[8];//assigning 8 columns to line 4th
               Numfive[4]=new long[9];//Assign 9 columns to line 5th

NUMFIVE[0][4]=10000000000L;//1 Row 5 Column =10000000000

System.out.println (Numfive[0][4]); Print line break output

Print output An array that does not have an array element defined by Java will automatically initialize him to a value of 0
System.out.println (Numfive[4][7]);

     }
}

Defines a 2-D array that assigns an initial value to the 4 definition
Class Numsix
{
public static void Main (string[] args)
{

Defines an array of type Double assigns 3 rows and 3 columns of space at the same time to assign values

Double[][] numsix={{1.111d,2.222d,3.333d},{4.444d,5.555d,6.666d}};

System.out.println (Numsix[0][0]); Print line break output 1 rows 1 columns =1.111
System.out.println (numsix[1][1]); Print line break output 2 rows 2 columns =5.555
}
}

Define a 2-D array 5 define an irregular 2-dimensional array and assign an initial value
Class Numseven
{
public static void Main (string[] args)
{

There's nothing to say if you don't understand it then don't learn it!

     int[][] numseven=new int[][]{{10,20,30},{40,50},{60}};
     System.out.println (numseven[0][2]);
     System.out.println (numseven[1][1]);
     System.out.println (numseven[0][0]);
 }
}

Define a 2-dimensional array 6 define an irregular 2-dimensional array and assign the initial value;
Class Numeight
{
public static void Main (string[] args)
{
Int[][] numeight={{100,200,300,400},{500,600,700,800},{900,1000,1100,1200,1300}};
System.out.println (numeight[0][2]);
System.out.println (numeight[1][2]);
System.out.println (numeight[2][1]);
}
}

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Java defines several ways to define two-dimensional arrays