学步园

 声明一个矩阵类Matrix，有这样一些实例方法：将一个矩阵转置、求两个矩阵的和。

public class Matrix

{private int mx[][],m,n;

  public Matrix(int r,int c)

 {m=r;

   n=c;

   mx=new int[m][n];

   iniMatrix();}

 public Matrix()

  {m=3;

    n=3;

   mx=new int[3][3];

  iniMatrix();}

public void iniMatrix()

  {int i,j;

   for(i=0;i<=m-1;i++)

  for(j=0;j<=n-1;j++)

  mx[i][j]=(int)(Math.random()*100);}

public void tranMatrix()

{int i,j,t;

  int mt[][]=new int[m][n];

  for(i=0;i<=m-1;i++)

  for(j=0;j<=n-1;j++)

  mt[i][j]=mx[i][j];

  t=m;

  m=n;

  n=t;

  mx=new int[m][n];

  for(i=0;i<=m-1;i++)

  for(j=0;j<=n-1;j++)

  mx[i][j]=mt[j][i];}

 public  void printMatrix()

{int i,j;

  for(i=0;i<=m-1;i++)

 { for(j=0;j<=n-1;j++)

   System.out.print("   "+mx[i][j]);

   System.out.println();}

  }

public void addMatrix(Matrix b)

{int i,j;

  for(i=0;i<=m-1;i++)

  for(j=0;j<=n-1;j++)

   mx[i][j]=mx[i][j]+b.mx[i][j];  }

public static void main(String args[])

{Matrix ma=new Matrix(4,3);

 Matrix mb=new Matrix(4,3);

System.out.println("The  matrix_A:");

ma.printMatrix();

System.out.println("The  matrix_B:");

mb.printMatrix();

System.out.println("Matrix_A + Matrix_B:");

ma.addMatrix(mb);

 ma.printMatrix();

System.out.println("Transpose Matrix_B:");

mb.tranMatrix();

 mb.printMatrix();

}}