class FunWithArrays {
  public static void main (String[] argv) {

  // declaring and generation of arrays
  int[] a;
  a = new int[3]; // initialized with 0

  System.out.println("int[] a; a = new int[3];");
  System.out.println("a: "+a[0]+", "+a[1]+", "+a[2]);
  System.out.println("a reference:" + a + "\n");
 
  a[0]=30; a[1]=31; a[2]=32; 
  
  System.out.println("a[0]=30; a[1]=31; a[2]=32;");
  System.out.println("a: "+a[0]+", "+a[1]+", "+a[2]+"\n");
 
  int[] b = {40,41,42};
  
  System.out.println("int[] b = {40,41,42};");
  System.out.println("b: "+b[0]+", "+b[1]+", "+b[2]);
  System.out.println("b reference:" + b +"\n");
 
  // assigning array names
  b=a; // array b is deleted by the garbage collection 
  
  System.out.println("b=a;");
  System.out.println("b: "+b[0]+", "+b[1]+", "+b[2]+"\n");
 
  b[1]=99;
  
  System.out.println("b[1]=99;");
  System.out.println("b: "+b[0]+", "+b[1]+", "+b[2]);
  System.out.println("a: "+a[0]+", "+a[1]+", "+a[2]);
  System.out.println("a reference:" + a);
  System.out.println("b reference:" + b + "\n");
  
  // copy arrays
  b = new int[a.length];
  b[0]=a[0];
  b[1]=a[1];
  b[2]=a[2];
  // copy with a loop
  // for (int i=0; i<a.length; i++) { b[i]=a[i]; }
  
  System.out.println("b = new int[a.length]; b[0]=a[0]; b[1]=a[1]; b[2]=a[2];");
  System.out.println("b: "+b[0]+", "+b[1]+", "+b[2]);
  System.out.println("a: "+a[0]+", "+a[1]+", "+a[2]);
  System.out.println("a reference:" + a);
  System.out.println("b reference:" + b +"\n");
  
  b[1]=999;
  
  System.out.println("b[1]=999;");
  System.out.println("b: "+b[0]+", "+b[1]+", "+b[2]);
  System.out.println("a: "+a[0]+", "+a[1]+", "+a[2]+"\n");
 
  // comparison
  b[1]=99;
  System.out.println("b[1]=99;");
  System.out.println("b: "+b[0]+", "+b[1]+", "+b[2]);
  System.out.println("a: "+a[0]+", "+a[1]+", "+a[2]);
  
  boolean isEqual = a==b;
  
  System.out.println("a==b: " + isEqual);
  
  }
}