www.pudn.com > ThinkinginJava4thEdition(SourceCode).zip > CompType.java

//: arrays/CompType.java 
// Implementing Comparable in a class. 
import java.util.*; 
import net.mindview.util.*; 
import static net.mindview.util.Print.*; 
 
public class CompType implements Comparable { 
  int i; 
  int j; 
  private static int count = 1; 
  public CompType(int n1, int n2) { 
    i = n1; 
    j = n2; 
  } 
  public String toString() { 
    String result = "[i = " + i + ", j = " + j + "]"; 
    if(count++ % 3 == 0) 
      result += "\n"; 
    return result; 
  } 
  public int compareTo(CompType rv) { 
    return (i < rv.i ? -1 : (i == rv.i ? 0 : 1)); 
  } 
  private static Random r = new Random(47); 
  public static Generator generator() { 
    return new Generator() { 
      public CompType next() { 
        return new CompType(r.nextInt(100),r.nextInt(100)); 
      } 
    }; 
  } 
  public static void main(String[] args) { 
    CompType[] a = 
      Generated.array(new CompType[12], generator()); 
    print("before sorting:"); 
    print(Arrays.toString(a)); 
    Arrays.sort(a); 
    print("after sorting:"); 
    print(Arrays.toString(a)); 
  } 
} /* Output: 
before sorting: 
[[i = 58, j = 55], [i = 93, j = 61], [i = 61, j = 29] 
, [i = 68, j = 0], [i = 22, j = 7], [i = 88, j = 28] 
, [i = 51, j = 89], [i = 9, j = 78], [i = 98, j = 61] 
, [i = 20, j = 58], [i = 16, j = 40], [i = 11, j = 22] 
] 
after sorting: 
[[i = 9, j = 78], [i = 11, j = 22], [i = 16, j = 40] 
, [i = 20, j = 58], [i = 22, j = 7], [i = 51, j = 89] 
, [i = 58, j = 55], [i = 61, j = 29], [i = 68, j = 0] 
, [i = 88, j = 28], [i = 93, j = 61], [i = 98, j = 61] 
] 
*///:~