java - Trouble with toString method -

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why won't variables basica (crank) , basicb (pedal) show in arraylist display along other values? there's class called part can post if needed, seems ignoring variables.

main class

    package main;      import java.util.arraylist;     import java.util.list;     import java.util.scanner;  public class testassembledpart {  public static void main(string[] args) {     // todo auto-generated method stub      scanner sc = new scanner(system.in);     list<assembledpart> aparts = new arraylist<assembledpart>();     aparts.add(new assembledpart("a200", "crank & pedal", 10, 3.5, "crank", "pedal"));       system.out.println("part before stock level change - start");      system.out.println(assembledpart.toassembledstring(aparts));  }  }

assembledpart class

 package main;  import java.util.*;  public class assembledpart extends part {  private string basica; private string basicb;  public assembledpart(string id, string name, int stocklevel, double unitprice,                      string basica, string basicb) {      super(id, name, stocklevel, unitprice);      this.basica = basica;     this.basicb = basicb; }   public string toassembledstring(string id, string name, int stocklevel, double unitprice) {     return id + " | " + name + " | " + stocklevel + " | " + unitprice + " | " + basica + " | " + basicb; }  public static string toassembledstring(collection<assembledpart> aparts){     string s = "";     (assembledpart apart: aparts){         s += apart + "\n";     }     return s; } }

part class

  package main;   import java.util.*;    public class part {  private string id; private string name; private int stocklevel; private double unitprice;  private int qty = 6000;  public part(string id, string name, int stocklevel, double unitprice){     this.id = id;     this.name = name;     this.stocklevel = stocklevel;     this.unitprice = unitprice; }   string partsavailable() {     //string newline = system.getproperty("line.separator");     return (id + "\t" + name + "\t    " + stocklevel + "\t\t   " + unitprice); }   public string getid() {     return id; }  public void setid(string id) {     this.id = id; }  public string getname() {     return name; }  public void setname(string name) {     this.name = name; }  public int getstocklevel(){     return stocklevel - qty; }  public void setstocklevel(int stocklevel){     this.stocklevel = stocklevel; }  public double getunitprice(){     return unitprice; }  public void setunitprice(double unitprice){     this.unitprice = unitprice; }  public void replenish(int qty){     this.stocklevel = stocklevel + qty; }  public double supply(int qty){     return unitprice * qty; }  public string tostring() {     return id + " | " + name + " | " + stocklevel + " | " + unitprice; }   public static string tostring(collection<part> parts){     string s = "";     (part part: parts){         s += part + "\n";     }     return s; }

}

output

because not calling toassembledstring() method, calling tostring() method, (i expect) implemented in part class.

instead this:

for (assembledpart apart: aparts){     s += apart + "\n";

do this:

for (assembledpart apart: aparts){     s += apart.toassembledstring() + "\n";

then, should avoid parameters in instance methods:

public string toassembledstring(string id, string name, int stocklevel, double unitprice) {     return id + " | " + name + " | " + stocklevel + " | " + unitprice + " | " + basica + " | " + basicb; }

do follows:

public string toassembledstring() {     return super.tostring() + " | " + basica + " | " + basicb; }

thanks @parker_halo comment


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