variable assignment - Field Overwrite does not work within a method body - Java -

here's question goes right basics (i think) although had me stumped in recent coding project undertook few friends.

here's code variation one:

public class test {  private string test;  public test(){     test = "tester";     changestring(test); }  public void changestring(string t){     t = "blue apples"; }  public string gettest(){     return test; }  public static void main(string[] args){     test t = new test();     system.out.println(t.gettest()); } } 

why program print out "tester" instead of "blue apples"? shouldn't method changestring(string) turn field 'test' "blue apples"?

thanks responses in advance!

java pass value , not pass reference. therefore, changes made passed t string, won't reflected in test string.

public void changestring(string t){     t = "blue apples";     test = t; // include line assign value of `t` `test`. }