使用 Collection 類的 collection.remove() 方法來刪除集合中的指定的元素
完整代碼
import java.util.*;
public class Main {
public static void main(String [] args) {
System.out.println( "集合實例!\n" );
int size;
HashSet collection = new HashSet ();
String str1 = "Red", str2 = "Yellow", str3 =
"White", str4 = "Blue";
Iterator iterator;
collection.add(str1);
collection.add(str2);
collection.add(str3);
collection.add(str4);
System.out.print("集合數據: ");
iterator = collection.iterator();
while (iterator.hasNext()){
System.out.print(iterator.next() + " ");
}
System.out.println();
collection.remove(str2);
System.out.println("刪除之後 [" + str2 + "]\n");
System.out.print("現在集合的數據是: ");
iterator = collection.iterator();
while (iterator.hasNext()){
System.out.print(iterator.next() + " ");
}
System.out.println();
size = collection.size();
System.out.println("集合大小: " + size + "\n");
}
}
結果輸出
集合實例!
集合數據: Red Yellow White Blue
刪除之後 [Yellow ]
現在集合的數據是: Red White Blue
集合大小: 3