Several ways of writing Java-defined two-dimensional arrays (summary) _java

As shown below:

Class Numthree
{public
static void Main (string[] args)
{
float[][] numthree;       Defines a float-type 2-d array
numthree=new float[5][5];    Allocate 5 rows of 5 columns of space to size
numthree[0][0]=1.1f;      Access to   1 rows of 1 columns of =1.1 numthree[1][0]=1.2f by subscript index
;                 2 rows of 1 columns =1.2
numthree[2][0]=1.3f;                 3 Rows of 1 columns =1.3
numthree[3][0]=1.4f;                 4 rows of 1 columns =1.4
numthree[4][0]=1.5f;                 5 rows of 1 columns =1.5
System.out.println (numthree[0][0]);//print line-wrapping output
System.out.println (numthree[1][0));
System.out.println (Numthree[2][0]);
System.out.println (Numthree[3][0]);
System.out.println (Numthree[4][0]);
}

//definition of two-dimensional array notation 2 definition of concurrent allocation space size class Numfour {public static void main (string[] args) {Shor T[][] Numfour=new short[5][8];
  Defines a short type of array and assigns it 5 rows of 8 columns of space size numfour[0][7]=10;
  numfour[1][6]=20;
  numfour[2][5]=30;
  numfour[3][4]=40;
  numfour[4][3]=50;
  System.out.println (Numfour[0][7]);
  System.out.println (Numfour[1][6]);
  System.out.println (Numfour[2][5]);
  System.out.println (Numfour[3][4]);
System.out.println (Numfour[4][3]); }
}

//definition two-dimensional array notation 3 irregular array class Numfive {public static void main (string[] args) {long[][] n   Umfive=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];       Assign 8 columns to line 4th numfive[4]=new Long[9];     Allocate 9 column numfive[0][4]=10000000000l to line 5th;     1 rows of 5 columns =10000000000 numfive[1][5]=20000000000l;     2 rows of 6 columns =20000000000 numfive[2][6]=30000000000l;     3 Rows of 7 columns =30000000000 numfive[3][7]=40000000000l;     4 rows of 8 columns =40000000000 numfive[4][8]=50000000000l; 5 Rows of 9 columns =50000000000 System.out.println (numfive[0][4]);
Print line-Wrapping output System.out.println (numfive[1][5]);
System.out.println (Numfive[2][6]);
System.out.println (Numfive[3][7]);
System.out.println (Numfive[4][8]); System.out.println (Numfive[4][7]); PrintOut An array Java that does not define an array element will automatically initialize the value to 0}} 

To define the 2-D array notation 4  , assign the initial value
class Numsix
{public
static void Main (string[] args)
{
double[][] numsix={{1.111d,2.222d,3.333d},{4.444d,5.555d,6.666d}};//defines a double array allocating 3 rows and 3 columns of space and assigning
System.out.println ( Numsix[0][0]); Print line wrap output 1 rows 1 columns =1.111
System.out.println (numsix[1][1]);//print line-break output 2 rows 2 columns =5.555
}
}

Define 2-D array notation 5  define an irregular 2-D array and assign the initial value
class Numseven
{public
static void Main (string[] args)
{
int[][] numseven=new int[][]{{10,20,30},{40,50},{60};//There's nothing to talk about. If you don't understand, then don't learn!
System.out.println (numseven[0][2]);
System.out.println (numseven[1][1]);
System.out.println (Numseven[0][0]);
}

Define 2-D array notation 6 define an irregular 2-D 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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