Please help me explain the Java mechanism for transpose a matrix (code is attached) -

i newbie java, currently, practicing codes of java. trying build matrix class myself. however, refers code jama (http://math.nist.gov/javanumerics/jama/doc/jama/matrix.html). feel quite strange. here structure of matrix class, jama defined in later part.

can me explain why transpose() return x (in thinking, c array stransposed elements of x,elements of x same order. why jama return x, , role of c-array in program?). thank much.

public class matrix {      private double[][] a;// 2-d array hold matrix element     private m,n ; // number of column , row.     // constructors omit      //public methods:      // don't understand this:     public matrix transpose () {       matrix x = new matrix(n,m);       double[][] c = x.getarray();       (int = 0; < m; i++) {          (int j = 0; j < n; j++) {             c[j][i] = a[i][j];          }       }       return x; // while returns x? seem x not transpose c.                 // seems there no connection between x , c.  role of c here?    }      public double[][] getarray () {       return a;    }         } 

there connection between x , c. when call getarray() return a itself, not copy of a.

so in context of transpose() method, c same x.a.

you can read behaviour of reference variables in java