002-Several basic operations of an array

1  Packageoo2_array_code_processing;2 3 Importjava.util.Arrays;4 5 /**6  * @authorAlazy_cat7 * Typical array code processing:8 * 1. Find the largest element in the array9 * 2. Calculate the average of an array elementTen * 3. Copying an array One * 4. Reverse the order of the array elements A * 5. Multiply matrix -  */ -  Public classArraycodeprocessin { the      Public Static voidMain (string[] args) { -         int[] A =New int[8]; -          for(inti=0; i<a.length; i++) { -A[i] = (int) (Math.random () * 100); +         } -          +         int[] B = {{1, 2, 3, 4}, {4, 5, 6, 7}, {7, 8, 9, 10}}; A         int[] C = {{1, 4}, {2, 5}, {3, 6}, {4, 7}}; atSystem.out.println ("Array:" +arrays.tostring (a)); -System.out.println ("The largest number in the array:" +Getmax (a)); -System.out.println ("The average value in the array:" +Getaverage (a)); -System.out.println ("Copy array:" +arrays.tostring (Copyarray (a))); -SYSTEM.OUT.PRINTLN ("Reverse array order:" +arrays.tostring (Reversearray (a))); -System.out.println ("Matrix multiplication:"); in         //the condition for matrix A to be multiplied by Matrix B is the number of columns of a = = number of rows of B -         if(B[0].length = =c.length) { to             int[] D =Matrixmultiply (b, c); +              for(inti=0; i<d.length; i++) { -                  for(intj=0; j<d[0].length; J + +) { theSystem.out.print (D[i][j] + ""); *                 } $ System.out.println ();Panax Notoginseng             } -}Else { the             Throw NewIllegalArgumentException ("These two matrices cannot be multiplied ..."); +         } A     } the     //find the largest element in an array +      Public Static intGetmax (int[] a) { -         intMax =Integer.min_value; $          for(intx:a) { $             if(X >max) -Max =x; -         } the         returnMax; -     }Wuyi     //computes the average of an array element the      Public Static DoubleGetaverage (int[] a) { -         intsum = 0; Wu         DoubleAverage = 0.0; -          for(intx:a) { AboutSum + =x; $         } -Average = sum/a.length; -         returnaverage; -     } A     //Copying an array +      Public Static int[] Copyarray (int[] a) { the         int[] B =New int[a.length]; -          for(inti=0; i<a.length; i++) { $B[i] =A[i]; the         } the         returnb; the     } the     //Reverse array element order -      Public Static int[] Reversearray (int[] a) { in         intMID = A.length/2; the         inttemp = 0; the          for(inti=0; i<mid; i++) { Abouttemp =A[i]; theA[i] = a[a.length-i-1]; theA[A.LENGTH-I-1] =temp; the         } +         returnA; -     } the     //matrix multiplicationBayi      Public Static int[] Matrixmultiply (int[] A,int[] b) { the         int[] C =New int[A.length] [B[0].length]; the          for(intI=r; k<a.length; k++) { -              for(inti=0; i<b[0].length; i++) { -                  for(intj=0; j<b.length; J + +) theC[k][i] + = a[k][j] *B[j][i]; the             } the         } the         returnC; -     } the}

002-Several basic operations of an array