我对Java还是很陌生,想编写代码来创建对象,显示(打印)并对其进行编辑。
我写了一个课程:
公共类人{
protected String firstName;
protected String lastName;
protected String fullName;
protected Date dob;
protected int id;
public Person(String firstName, String lastName, Date dob, int id) {
this.firstName = firstName;
this.lastName = lastName;
this.dob = dob;
this.fullName = this.firstName + " " + this.lastName;
this.id = id;
}
public String getFirstName() {return this.firstName;}
public String getLastName() {return this.lastName;}
public String getFullName() {
return this.fullName;
}
public Date getDob() {
return this.dob;
}
public int getId() {
return this.id;
}
public void printAll() {
System.out.println(this.fullName);
System.out.println(this.dob);
System.out.println(this.id);
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public void setDob(Date dob) {
this.dob = dob;
}
public boolean containsFullName(String fullName) {
if (this.fullName.equalsIgnoreCase(fullName)) {
return true;
} else {
return false;
}
}
public boolean containsId(int id) {
if (this.id == id) {
return true;
} else {
return false;
}
}
}
我在主类中创建了一个人数组。 (100个对象)。
公共类Main {
final static int MAX_NUMBER_PERSONS = 100;
static Person[] person = new Person[MAX_NUMBER_PERSONS];
static int mainCount = 0;
static Scanner scan = new Scanner(System.in);
根据相应的命令,用户可以在此数组内创建一个对象(它是德语,但基本上是其读取的名字,姓氏和出生日期)。 mainCount用于跟踪创建对象在数组中的哪个位置:
公共静态无效值createPerson()抛出ParseException {
Scanner scan = new Scanner(System.in);
// Namen erfassen:
System.out.println("Bitte den Vornamen der Person eingeben:");
String firstName = scan.nextLine();
System.out.println("Bitte den Nachnamen der Person eingeben:");
String lastName = scan.nextLine();
String fullName = firstName + " " + lastName;
// DOB erfassen:
System.out.println("Bitte Geburtsdatum von " + fullName + " eingeben (TT/MM/JJJJ):");
String dob = scan.next();
Date dobDate = new SimpleDateFormat("dd/MM/yyyy").parse(dob);
int id = mainCount;
person[mainCount] = new Person(firstName, lastName, dobDate, id);
++mainCount;
System.out.println("Du hast Person Nummer " + mainCount + " erstellt");
}
现在的实际问题:调用以下方法,用户应该能够使用用户输入和设置器来编辑数组中所需的对象:
public static void editPerson()引发ParseException {扫描仪扫描=新的Scanner(System.in);System.out.println(“ Bit ID der zu zu bearbeitenden Person eingeben(zu findenüber)...”);int id = scan.nextInt();scan.nextLine();searchByIdReturn(id).printAll();
System.out.println("Diese Person bearbeiten? Tippe <ja>, sonst zurück zum Menü.");
if(scan.next().equalsIgnoreCase("ja")) {
scan.nextLine();
System.out.println("Vorname eingeben...");
String firstName = scan.nextLine();
searchByIdReturn(id).setFirstName(firstName);
System.out.println("Nachname eingeben...");
String lastName = scan.nextLine();
searchByIdReturn(id).setLastName(lastName);
System.out.println("Bitte Geburtsdatum eingeben (TT/MM/JJJJ):");
String dob = scan.next();
Date dobDate = new SimpleDateFormat("dd/MM/yyyy").parse(dob);
searchByIdReturn(id).setDob(dobDate);
}
}
方法后,我查找对象。名字和姓氏保持不变。但是dob已根据需要进行了更改。
我想念的是什么?
非常感谢您!
您永远都不会更改fullName
,这是我认为您正在查看的。
this.fullName = this.firstName + " " + this.lastName;
您不需要存储它,每次计算起来都会更简单。
public String getFullName() {
return this.firstName + " " + this.lastName;
}
BTW测试已经是布尔值了,所以您来写。
public boolean containsId(int id) {
return this.id == id;
}