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

//: arrays/ComparatorTest.java 
// Implementing a Comparator for a class. 
import java.util.*; 
import net.mindview.util.*; 
import static net.mindview.util.Print.*; 
 
class CompTypeComparator implements Comparator { 
  public int compare(CompType o1, CompType o2) { 
    return (o1.j < o2.j ? -1 : (o1.j == o2.j ? 0 : 1)); 
  } 
} 
 
public class ComparatorTest { 
  public static void main(String[] args) { 
    CompType[] a = Generated.array( 
      new CompType[12], CompType.generator()); 
    print("before sorting:"); 
    print(Arrays.toString(a)); 
    Arrays.sort(a, new CompTypeComparator()); 
    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 = 68, j = 0], [i = 22, j = 7], [i = 11, j = 22] 
, [i = 88, j = 28], [i = 61, j = 29], [i = 16, j = 40] 
, [i = 58, j = 55], [i = 20, j = 58], [i = 93, j = 61] 
, [i = 98, j = 61], [i = 9, j = 78], [i = 51, j = 89] 
] 
*///:~