Chapter 17 collections btp170711

OneCodeOneTime · OneCodeOneTime · commit 430fb6e63fd7 · 2017-07-11T21:10:08.000+08:00
diff --git a/src/btp/oneP/TypesForSets.java b/src/btp/oneP/TypesForSets.java
@@ -0,0 +1,72 @@
+package btp.oneP;
+
+import java.util.HashSet;
+import java.util.Set;
+
+public class TypesForSets {
+	static <T> Set<T> fill(Set<T> set,Class<T> type){
+		try{
+			for(int i=0;i<10;i++){
+				set.add(type.getConstructor(int.class).newInstance(i));
+			}
+		}catch(Exception e){
+			throw new RuntimeException(e);
+		}
+		return set;
+	}
+	
+	static <T> void test(Set<T> set,Class<T> type){
+		fill(set,type);fill(set,type);fill(set,type);
+		System.out.println(set);
+	}
+	public static void main(String[] args) {
+		test(new HashSet<HashType>(),HashType.class);
+		test(new HashSet<HashType>(),HashType.class);
+		test(new HashSet<HashType>(),HashType.class);
+		test(new HashSet<HashType>(),HashType.class);
+		test(new HashSet<HashType>(),HashType.class);
+		test(new HashSet<HashType>(),HashType.class);
+		test(new HashSet<HashType>(),HashType.class);
+	}
+
+}
+
+class SetType{
+	int i;
+	public SetType(int n){
+		i = n;
+	}
+	public boolean equals(Object o){
+		return o instanceof SetType && (i == ((SetType)o).i);
+	}
+	public String toString(){
+		return Integer.toString(i);
+	}
+}
+
+class HashType extends SetType{
+
+	public HashType(int n) {
+		super(n);
+		// TODO Auto-generated constructor stub
+	}
+	
+	public int hashCode(){
+		return i;
+	}
+}
+
+class  TreeType extends SetType implements Comparable<TreeType>{
+
+	public TreeType(int n) {
+		super(n);
+		// TODO Auto-generated constructor stub
+	}
+
+	@Override
+	public int compareTo(TreeType o) {
+		// TODO Auto-generated method stub
+		return (o.i<i?-1:(o.i == i ? 0 : 1));
+	}
+	
+}
