Package com. Me. A service; 

The import com. Me. Domain. The Book; 
The import com. Me. Utils. InUtil; 
The import com. Me. View. BookView; 

import java.util.Vector; 

Public class BookService {
Private Vector Books=new Vector (); 
//private Book Book=new Book (1, "zhou shuren", "" home" ", "Beijing publishing house," the new BigDecimal (30)); 

/* * 
* to get all the books 
* @ return 
*/
Public Vector getAllBook () {
Return the books; 
} 

/* * 
* add books 
* @ param book 
*/
Public void same Book (Book) {
Books. The add (book); 
} 
Public void delectbook (Book Book) {
For (int I=0; i {
If (books. The size ()==0) {


} else {

return; 
} 


} 
Books. Remove (book); 

} 
Public void SearchBook (Book Book) {
Books. ElementAt (0); 
//input parameters. Equal ([index]. GetBookId) 

} 
} 

Remove and elementAT what to use

CodePudding user response:

1, first, define a class student

 package com. Smart. Call; 

import java.util.Arrays; 

/* * 
* @ author: cuantianhou 2020/4/30 
*/

Public class Student {

Public String getName () {
Return the name; 
} 

Public void elegantly-named setName (String name) {
this.name=name; 
} 

@ Override 
Public String toString () {
Return "Student {+" 
"Name='" + name +' \ '+' 
'} '; 
} 

private String name; 

@ Override 
Public Boolean equals (Object o) {
If (this==o) return true; 
If (o==null | | getClass ()!=o.g etClass ()); return false 
Student Student=(Student) o; 
Return this. The name. The equals (student getName ()); 
} 

@ Override 
Public int hashCode () {
Return Arrays. HashCode (new Object [] {name}); 
} 
} 

2, the definition of a Vector action class

 package com. Smart. Call; 

import java.util.Vector; 

/* * 
* @ author: cuantianhou 2020/5/6 
*/
Public class VectorTry {

Private Vector Students=new Vector (a); 

Public Vector getAll () {
Return students; 
} 

Public void the add (Student Student) {
Students. The add (student); 
} 

Public Student searchReturnObject Student (Student) {
Return null if (students. IsEmpty ()); 
For (Student element: students) {
If (element) equals (student)) {
Return the student; 
} 
} 
return null; 
} 


Public int searchReturnIndex Student (Student) {
If (students. IsEmpty ()) return - 1; 
for(int i=0; i If (students) get (I)) equals (student)) {
return i; 
} 
} 
return -1; 
} 

Public void deleteByStudent Student (Student) {
If (searchReturnObject (student)!=null) {
Students. Remove (student); 
} 
} 

Public void deleteByIndex Student (Student) {
Int index=searchReturnIndex (student); 
If (index!=1) {
Students. RemoveElementAt (index); 
} 
} 

Public void print () {
For (Student Student: students) {
System. The out. Println (student); 
} 
} 
} 

3, in defining a test class:

 package com. Smart. Call; 

/* * 
* @ author: cuantianhou 2020/5/6 
*/
Public class VectorMain {

Public static void main (String [] args) {
VectorTry VectorTry=new VectorTry (); 
for(int i=0; i<10; I++) {
Student Student=new Student (); 
Student. Elegantly-named setName (String. The valueOf (I)); 
VectorTry. Add (student); 
} 
VectorTry. Print (); 
Student Student=new Student (); 
Student. Elegantly-named setName (" 1 "); 
VectorTry. DeleteByIndex (student); 
System. The out. Println (" -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- - "); 
VectorTry. Print (); 
System. The out. Println (" -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- - "); 
Student. Elegantly-named setName (" 2 "); 
VectorTry. DeleteByStudent (student); 
VectorTry. Print (); 
} 
} 

4, the test result

 D: \ jdk1.8.0 _171 \ bin \ Java exe "- javaagent: D: \ IntelliJ IDEA 2018.1.1 \ lib \ idea_rt jar=59612: D: \ IntelliJ IDEA 2018.1.1 \ bin" - Dfile. Encoding=utf-8 - classpath D: \ jdk1.8.0 _171 \ jre \ lib \ charsets jar; D: \ jdk1.8.0 _171 \ jre \ lib \ deploy the jar. D: \ jdk1.8.0 _171 \ jre \ lib \ ext \ access - bridge - 64. The jar. D: \ jdk1.8.0 _171 \ jre \ lib \ ext \ cldrdata jar; D: \ jdk1.8.0 _171 \ jre \ lib \ ext \ DNSNS jar; D: \ jdk1.8.0 _171 \ jre \ lib \ ext \ jaccess jar; D: \ jdk1.8.0 _171 \ jre \ lib \ ext \ JFXRT jar; D: \ jdk1.8.0 _171 \ jre \ lib \ ext \ localedata jar; D: \ jdk1.8.0 _171 \ jre \ lib \ ext \ nashorn jar; D: \ jdk1.8.0 _171 \ jre \ lib \ ext \ sunec jar; D: \ jdk1.8.0 _171 \ jre \ lib \ ext \ sunjce_provider jar; D: \ jdk1.8.0 _171 \ jre \ lib \ ext \ sunmscapi jar; D: \ jdk1.8.0 _171 \ jre \ lib \ ext \ sunpkcs11 jar; D: \ jdk1.8.0 _171 \ jre \ lib \ ext \ zipfs jar; D: \ jdk1.8.0 _171 \ jre \ lib \ javaws jar; D: \ jdk1.8.0 _171 \ jre \ lib \ jce jar; D: \ jdk1.8.0 _171 \ jre \ lib \ JFR jar; D: \ jdk1.8.0 _171 \ jre \ lib \ JFXSWT jar; D: \ jdk1.8.0 _171 \ jre \ lib \ jsse jar; D: \ jdk1.8.0 _171 \ jre \ lib \ management - agent jar; nullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnull