如何判断两个类之间的差异
代码实现
package net.mindview.util;import java.util.*;public class Sets {public static <T> Set<T> union(Set<T> a,Set<T> b){Set<T> result=new HashSet<T>(a);result.addAll(b);return result;}public static <T> Set<T> intersection(Set<T> a,Set<T> b){Set<T> result=new HashSet<T>(a);result.retainAll(b);return result;}public static <T> Set<T> difference(Set<T> superset,Set<T> subset){Set<T> result=new HashSet<T>(superset);result.removeAll(subset);return result;}public static <T> Set<T> complement(Set<T> a,Set<T> b){return difference(union(a,b),intersection(a,b));}}?
package net.mindview.util;import java.lang.reflect.Method;import java.util.*;public class ContainerMethodDifferences {/** * 打印出java.util包中各种Collection和Map类之间的方法差异 */static Set<String> methodSet(Class<?> type){Set<String> result=new TreeSet<String>();for(Method m:type.getMethods()){result.add(m.getName());}return result;}static void interfaces(Class<?> type){System.out.println("Interfaces in "+type.getSimpleName()+":");List<String> result=new ArrayList<String>();for(Class<?> c:type.getInterfaces()){result.add(c.getSimpleName());}System.out.println(result);}static Set<String> object=methodSet(Object.class);static{object.add("clone");}static void difference(Class<?> superset,Class<?> subset){System.out.println(superset.getSimpleName()+" extends "+subset.getSimpleName()+" ,adds:");Set<String> comp=Sets.difference(methodSet(superset), methodSet(subset));comp.removeAll(object);System.out.println(comp);interfaces(superset);}public static void main(String[] args) {System.out.println("Collection: "+methodSet(Collection.class));interfaces(Collection.class);difference(Set.class,Collection.class);difference(HashSet.class,Set.class);difference(LinkedHashSet.class,HashSet.class);difference(TreeSet.class,Set.class);difference(List.class,Collection.class);difference(ArrayList.class,List.class);difference(LinkedList.class,List.class);difference(Queue.class,Collection.class);difference(PriorityQueue.class,Queue.class);System.out.println("Map: "+methodSet(Map.class));difference(HashMap.class,Map.class);difference(LinkedHashMap.class,HashMap.class);difference(SortedMap.class,Map.class);difference(TreeMap.class,Map.class);}}?