Java array passing reference instead of value -

so have one-dimensional boolean array representing two-dimensional shape. it's numbered 0-8, representing 3x3 square index:

012 345 678 

i wrote function rotate shape clockwise using following code:

newshape[2]=oldshape[0]; newshape[5]=oldshape[1]; newshape[8]=oldshape[2]; newshape[1]=oldshape[3]; newshape[4]=oldshape[4]; newshape[7]=oldshape[5]; newshape[0]=oldshape[6]; newshape[3]=oldshape[7]; newshape[6]=oldshape[8]; 

now, when input of function is:

false-true-false true--true-false false-false-false 

the expected output be:

false-true-false false-true--true false-false-false 

however, instead get:

false-true-false true--true--true false-true-false 

this not result of newshape, also result of oldshape, though never change oldshape. seem assignments changing around references variables, not actual values. how can fix this?

it seems you're using same reference both newshape , oldshape. should use different arrays of course. able repoduce results. clone array

public class class {     public static void main(string[] args) {         boolean[] oldshape = new boolean[]{                 false, true, false,                 true, true, false,                 false, false, false         };          // doens twork         boolean[] newshape = oldshape;          //this work //        boolean[] newshape = new boolean[9];          output(oldshape);          newshape[2] = oldshape[0];         newshape[5] = oldshape[1];         newshape[8] = oldshape[2];         newshape[1] = oldshape[3];         newshape[4] = oldshape[4];         newshape[7] = oldshape[5];         newshape[0] = oldshape[6];         newshape[3] = oldshape[7];         newshape[6] = oldshape[8];          output(newshape);     }      private static void output(boolean[] s) {         (int = 0; < 3; ++i) {             (int j = 0; j < 3; ++j) {                 system.out.print(s[i*3+j] + " ");             }             system.out.println();         }         system.out.println();     } }