2回答

• 

  慕移动9181930

  2022-03-24 00:53:37

  mcrypt_encrypt和mcrypt_decrypt是用来进行字符串加密解密的加油，希望课程对你有帮助。

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• 

  该用户要学习了

  2018-03-14 18:01:17

  public class SetTest {
  
  	public Set<Course> Set_CourseToSelect;
  	public Course c;
  	public Course e;
  	public Course[] cc;
  	public Course[] ee;
  	public SetTest()
  	{
  		Set_CourseToSelect=new  HashSet<Course>();
  	}	
  	public void Add()
  	{
  		//1.add():
  		c=new Course(1,"java");
  		e=c;
  		Set_CourseToSelect.add(c);
  		//2.addAll():
  		cc=new Course[]{new Course(2,"C"),new Course(3,"C#")};
  		ee=cc;
  		Set_CourseToSelect.addAll(Arrays.asList(cc));
  	}
  	public void Remove()
  	{
  		//3.remove():
  		//Set_CourseToSelect.remove(e);
  		//4.removeAll():
  		Set_CourseToSelect.removeAll(Arrays.asList(ee));
  	}
  	public void Get()
  	{
  		System.out.println("-----------------------");
  		for(Course c:Set_CourseToSelect)
  		{
  			System.out.println(c.id+":"+c.name);
  		}
  		
  	}
  	/**
  	 * @param args
  	 */
  	public static void main(String[] args) 
  	{
  	  // TODO Auto-generated method stub
               SetTest st=new SetTest();
               st.Add();
               st.Remove();
               st.Get();
           }
    }

  
  

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