Class: isAssignableFrom(Class cls) : Class « java.lang « Java by API

1. Java by API
2. java.lang
3. Class

Class: isAssignableFrom(Class cls)

   


import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

public class Main {

  public static boolean isNumber(final Class dataType) {
    return Number.class.isAssignableFrom(dataType);
  }

  public static void main(final String[] args) {

    final Set classes = new HashSet();
    classes.add(Class.class);

    System.out.println("Using isAssignableFrom:");
    useAssignable(classes);
    System.out.println("\nUsing isInstance:");
    useIsInstance(classes);
  }


  public static void useAssignable(final Set inputSet) {
    final Iterator iter = inputSet.iterator();
    Object obj = null;

    while (iter.hasNext()) {
      obj = iter.next();
      if (obj != null) {
        if (Number.class.isAssignableFrom(obj.getClass())) {
          System.out.println(obj);
        }
      }
    }
  }


  public static void useIsInstance(final Set inputSet) {
    final Iterator iter = inputSet.iterator();
    Object obj = null;

    while (iter.hasNext()) {
      obj = iter.next();
      if (Number.class.isInstance(obj)) {
        System.out.println(obj);
      }
    }
  }

  public static void useIsInstance2(final Class dataType, final Set inputSet) {
    if (dataType == null) {
      throw new NullPointerException();
    }

    final Iterator iter = inputSet.iterator();
    Object obj = null;

    while (iter.hasNext()) {
      obj = iter.next();
      if (dataType.isInstance(obj)) {
        System.out.println(obj);
      }
    }
  }

}

   
    
    
  

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