1
나는 Java Collections를 처음 사용합니다. MyData, Initializer 및 SetBasics의 세 클래스가 있습니다.TreeSet는 하나의 값만 추가합니까?
HashSet 및 TreeSet을 만들었습니다. 이제 문제는 HashSet이 잘 작동하지만 TreeSet은 하나의 값만 저장하는 것입니다. 여기
는
클래스의 MyData
`패키지 collectionsWorkUp.setDemos 내 클래스이다;
공용 클래스의 MyData에 Comparable {
MyData(){
}
MyData(String n, String p, String eM, long mn, char s){
name = n;
profession = p;
email = eM;
mobileNo = mn;
sex = s;
}
private String name;
private String profession;
private String email;
private long mobileNo;
private char sex;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getProfession() {
return profession;
}
public void setProfession(String profession) {
this.profession = profession;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public long getMobileNo() {
return mobileNo;
}
public void setMobileNo(long mobileNo) {
this.mobileNo = mobileNo;
}
public char getSex() {
return sex;
}
public void setSex(char sex) {
this.sex = sex;
}
@Override
public int compareTo(MyData o) {
// TODO Auto-generated method stub
return 0;
}
} `
클래스 이니셜에게
패키지 collectionsWorkUp.setDemos을 구현;
공용 클래스 이니셜 {
/**
* @param args
*/
public static void main(String[] args) {
System.out.println("Initializing");
SetBasics operate = new SetBasics();
operate.DataInSet();
operate.printDataInSet(operate.getUsersInHash());
System.out.println("\n\nPrinting Data in Tree Set--------------------");
operate.printDataInSet(operate.getUsersInTree());
System.out.println("\n\n--------Program Terminated----------");
}
}
클래스 SetBasics
패키지 collectionsWorkUp.setDemos;
import java.util.HashSet; import java.util.Set; 가져 오기 java.util.TreeSet;
공용 클래스 SetBasics {
private Set<MyData> usersInHash = new HashSet<MyData>();
private Set<MyData> usersInTree = new TreeSet<MyData>();
MyData d1= new MyData(d1's data -data include name, #, profession etc check MyData Class);
MyData d2= new MyData(d2's data);
MyData d3= new MyData(d3's data);
MyData d4= new MyData(d4's data);
MyData d5= new MyData(d5's data);
MyData d6= new MyData(d6's data);
MyData d7= new MyData(d7's data);
MyData nullUser = null;
public Set<MyData> getUsersInHash() {
return usersInHash;
}
public Set<MyData> getUsersInTree() {
return usersInTree;
}
public SetBasics(){ }
public void DataInSet(){
{
System.out.println("Adding Data in HashSet");
System.out.println("Data in HashSet Before Adding Element:" + usersInHash.size());
setDataInSet(nullUser);
System.out.println("Data in HashSet After Adding Element:" + usersInHash.size());
setDataInSet(d7);
System.out.println("Data in HashSet After Adding Element:" + usersInHash.size());
setDataInSet(d6);
System.out.println("Data in HashSet After Adding Element:" + usersInHash.size());
setDataInSet(d5);
System.out.println("Data in HashSet After Adding Element:" + usersInHash.size());
setDataInSet(d4);
System.out.println("Data in HashSet After Adding Element:" + usersInHash.size());
setDataInSet(d3);
System.out.println("Data in HashSet After Adding Element:" + usersInHash.size());
setDataInSet(d2);
System.out.println("Data in HashSet After Adding Element:" + usersInHash.size());
setDataInSet(d1);
System.out.println("Data in HashSet After Adding Element:" + usersInHash.size());
setDataInSet(null);
System.out.println("Data in HashSet After Adding Element:" + usersInHash.size());
}
{
System.out.println("Adding Data in TreeSet");
System.out.println("Users in Tree after Before Data:"+usersInTree.size());
setDataInTreeSet(d7);
System.out.println("Users in Tree after Adding Data:"+usersInTree.size());
setDataInTreeSet(d6);
System.out.println("Users in Tree after Adding Data:"+usersInTree.size());
setDataInTreeSet(d5);
System.out.println("Users in Tree after Adding Data:"+usersInTree.size());
setDataInTreeSet(d4);
System.out.println("Users in Tree after Adding Data:"+usersInTree.size());
setDataInTreeSet(d3);
System.out.println("Users in Tree after Adding Data:"+usersInTree.size());
setDataInTreeSet(d2);
System.out.println("Users in Tree after Adding Data:"+usersInTree.size());
setDataInTreeSet(d1);
System.out.println("Users in Tree after Adding Data:"+usersInTree.size());
printDataInSet(usersInTree);
}
}
public void setDataInSet(MyData userDetails){
System.out.println("Setting Data in HashSet");
usersInHash.add(userDetails);
}
public void setDataInTreeSet(MyData userDetails){
System.out.println("Setting Data in TreeSet");
usersInTree.add(userDetails);
}
public void printDataInSet(Set<MyData> s){
System.out.println("Printing Data");
System.out.println("Size of the Set:"+s.size());
for(MyData itorator: s){
try{
System.out.println("User Details:______");
System.out.println("Name:"+itorator.getName());
System.out.println("Mobile Number:"+itorator.getMobileNo());
System.out.println("eMail:"+itorator.getEmail());
System.out.println("Profession:"+itorator.getProfession());
System.out.println("Sex:"+itorator.getSex());
}catch(NullPointerException npe){
System.out.println(npe.getMessage());
npe.getStackTrace();
}finally{
System.out.println("EOD_____\n");
}
}
}
}
이제 문제는 TreeSet의에서 난 단지에만 D7 및 다른 아무것도의 데이터를 볼 수있다는 TreeSet의
의 중복 가능성 [왜 TreeSet의 첫 번째 요소를 넘어 아무것도 추가하지 않습니다?] (http://stackoverflow.com/questions/22123336/why-does-my-treeset-not-add-anything- 너머 첫 번째 요소) – Raedwald