arrays - make a global object in java -

i want make array of objects , use in different functions. wrote pseudocode

privat stock[] d;  privat stock example;   public void stockcheck(){     d =new stock[2];      d[0]= new stock("a","test1", 22);     d[1]= new stock("b","test2", 34);   }    @override public stock getstock(string name) throws stockchecknotfoundexception{      int i;               system.out.println("ok" + name + d.legth); // error      example = new stock("example","example",2);     return example; } 

in class test make instance of getstock , call function getstock stock.getstock();

i nullpointerexeption when d.length. d null don't understand why.

perhaps example of code need, using 3 classes

• test - main test code
• stock - implied code stock question
• stockcheck - corrected code question.

(note: may want use arraylist inside stockquote can add , delete stocks.)

test class

package stackjavaexample; public class test {     public static void main(string[] args) {         string[] testnames = {"test1","test2","notthere"};         stockcheck mstockcheck = new stockcheck();          (int i=0; i<testnames.length; i++) {             stock result = mstockcheck.getstock(testnames[i]);             if (result == null) {                 system.out.println("no stock name: " + testnames[i]);             } else {                 system.out.println("found stock: " + result.getname() + ", " + result.getsymbol() + ", " + result.getvalue());             }         }     } } 

stock class

package stackjavaexample; public class stock {     private string symbol;     private string name;     private double value;     public stock(string symbol, string name, double value) {         this.symbol = symbol;         this.name = name;         this.value = value;     }     public string getsymbol() { return symbol;}     public string getname() { return name;}     public double getvalue() {return value;} } 

stockcheck class

package stackjavaexample; public class stockcheck {     private stock[] d;     public stockcheck() {         d = new stock[2];         d[0] = new stock("a","test1", 22);         d[1] = new stock("b","test2", 34);     }     public stock getstock(string name) {         (int i=0; < d.length; i++) {             if (d[i].getname().equalsignorecase(name)) {                 return d[i];             }         }         return null;     } }