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java對(duì)象和對(duì)象數(shù)組轉(zhuǎn)換

java中的對(duì)象和對(duì)象數(shù)組是兩種不同的數(shù)據(jù)類型,他們之間的轉(zhuǎn)換可以幫助我們更好的利用和管理我們的數(shù)據(jù)

public class Person {
private String name;
private int age;
//構(gòu)造方法
public Person(String name, int age) {
this.name = name;
this.age = age;
}
}
//創(chuàng)建一個(gè)對(duì)象數(shù)組
Person[] personArray = new Person[3];
personArray[0] = new Person("張三", 18);
personArray[1] = new Person("李四", 20);
personArray[2] = new Person("王五", 22);

對(duì)象數(shù)組可以將多個(gè)對(duì)象存儲(chǔ)在同一個(gè)數(shù)組中,我們也可以通過(guò)對(duì)象數(shù)組來(lái)創(chuàng)建單個(gè)對(duì)象

public class Main {
public static void main(String[] args) {
//獲取personArray[0]對(duì)象的引用
Person person = personArray[0];
//輸出person對(duì)象的name和age屬性
System.out.println("name:" + person.name + ", age:" + person.age);
}
}

我們也可以通過(guò)對(duì)象數(shù)組來(lái)將多個(gè)對(duì)象轉(zhuǎn)換為一個(gè)對(duì)象,這個(gè)過(guò)程叫做對(duì)象數(shù)組到對(duì)象的轉(zhuǎn)換

public class Main {
public static void main(String[] args) {
//將personArray轉(zhuǎn)換為L(zhǎng)ist集合
Listlist = Arrays.asList(personArray);
//通過(guò)list集合轉(zhuǎn)換為單個(gè)對(duì)象
Person person = list.get(0);
//輸出person對(duì)象的name和age屬性
System.out.println("name:" + person.name + ", age:" + person.age);
}
}

在轉(zhuǎn)換過(guò)程中我們需要注意的是,對(duì)象數(shù)組必須是同一類型的對(duì)象,轉(zhuǎn)換時(shí)也需要保證每個(gè)對(duì)象的屬性值是正確的