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누군가 제게 두 프로그램의 차이점을 설명 할 수 있습니까? 기본적으로 일반과 객체의 차이점이 있습니다. 도 이유가 System.out.println ("1을 세트에 추가 :"+ vs.add (새 문자열 ("Hello")))); 첫 번째 프로그램Java Vector Set
최초의 벡터 설정 프로그램
import java.util.Vector;
class VectorSet1 {
boolean add(Object obj) {
if (contains(obj)) return false;
v.add(obj);
return true;
}
boolean contains(Object obj) {return v.contains(obj);}
public String toString() {return v.toString();}
void clear() {v.clear();}
int size() {return v.size();}
boolean isEmpty() {return v.isEmpty();}
Vector v = new Vector();
public static void main(String [] args) {
VectorSet1 vs = new VectorSet1();
System.out.println("set: " + vs);
System.out.println("adding 1 to the set: " + vs.add(1));
System.out.println("adding 5 to the set: " + vs.add(5));
System.out.println("adding 17 to the set: " + vs.add(17));
System.out.println("adding 1 to the set: " + vs.add(1));
//System.out.println("adding 1 to the set: " + vs.add(new String("Hello")));
System.out.println("set: " + vs);
System.out.println("testing if 1 s in the set: " + vs.contains(1));
System.out.println("testing if 17 is in the set: " + vs.contains(17));
System.out.println("testing if 6 is in the set: " + vs.contains(6));
System.out.println("set is empty: " + vs.isEmpty());
System.out.println("size of set: " + vs.size());
vs.clear();
System.out.println("after invoking clear");
System.out.println("set: " + vs);
System.out.println("set is empty: " + vs.isEmpty());
System.out.println("size of set: " + vs.size());
}
}
두 번째 벡터 설정 프로그램
import java.util.Vector;
import java.util.Iterator;
class VectorSet2<E> {
boolean add(E e) {
if (contains(e)) return false;
v.add(e);
return true;
}
boolean contains(E e) {return v.contains(e);}
public String toString() {return v.toString();}
void clear() {v.clear();}
int size() {return v.size();}
boolean isEmpty() {return v.isEmpty();}
Vector<E> v = new Vector<E>();
public static void main(String [] args) {
VectorSet2<Integer> vs = new VectorSet2<Integer>();
System.out.println("set: " + vs);
System.out.println("adding 1 to the set: " + vs.add(1));
System.out.println("adding 5 to the set: " + vs.add(5));
System.out.println("adding 17 to the set: " + vs.add(17));
System.out.println("adding 1 to the set: " + vs.add(1));
//System.out.println("adding Hello to the set: " + vs.add("Hello"));
System.out.println("set: " + vs);
System.out.println("testing if 1 s in the set: " + vs.contains(1));
System.out.println("testing if 17 is in the set: " + vs.contains(17));
System.out.println("testing if 6 is in the set: " + vs.contains(6));
System.out.println("set is empty: " + vs.isEmpty());
System.out.println("size of set: " + vs.size());
vs.clear();
System.out.println("after invoking clear");
System.out.println("set: " + vs);
System.out.println("set is empty: " + vs.isEmpty());
System.out.println("size of set: " + vs.size());
}
}
http://docs.oracle.com/javase/tutorial/java/generics/ – gtgaxiola
코드에 대한 좋은 설명을 묻지 않고 두 예제 모두 이해하기 어려운 부분을 물어보십시오. –