Whats wrong in my code

package com.codegym.task.task03.task0307; /* Hello, StarCraft! */ public class Solution { public static void main(String[] args) { Zerg z1=new Zerg(); z1.name="aa"; Zerg z2=new Zerg(); z2.name="aa"; Zerg z3=new Zerg(); z3.name="aa"; Zerg z4=new Zerg(); z4.name="aa"; Zerg z5=new Zerg(); z5.name="aa"; Protoss p1=new Protoss(); p1.name="aa"; Protoss p2=new Protoss(); p2.name="aa"; Protoss p3=new Protoss(); p3.name="aa"; Terran t1=new Terran(); t1.name="aa"; Terran t2=new Terran(); t2.name="aa"; Terran t3=new Terran(); t3.name="aa"; Terran t4=new Terran(); t4.name="aa"; } public static class Zerg { public String name; } public static class Protoss { public String name; } public static class Terran { public String name; } }