我们如何在Java中的对象参数中初始化数组?
您可以使用构造函数或使用setter方法来初始化与其他任何值一样在类内部声明的数组变量。
示例
在下面的Java示例中,我们声明一个数组类型的实例变量,并从构造函数中对其进行初始化。
public class Student { String name; int age; String subs[]; Student(String name, int age, String subs[]){ this.name = name; this.age = age; this.subs = subs; } public void display() { System.out.println("Name: "+this.name); System.out.println("Age :"+this.age); System.out.print("Subjects: "); for(int i = 0; i < subs.length; i++) { System.out.print(subs[i]+" "); } } public static void main(String args[]) { String subs[] = {"Mathematics", "English", "Science", "Social"}; Student obj = new Student("Krishna", 25, subs); obj.display(); } }
输出结果
Name: Krishna Age :25 Subjects: Mathematics English Science Social
例2
public class Student { String name; int age; String subs[]; public void setName(String name) { this.name = name; } public void setAge(int age) { this.age = age; } public void setSubs(String[] subs) { this.subs = subs; } public void display() { System.out.println("Name: "+this.name); System.out.println("Age :"+this.age); System.out.print("Subjects: "); for(int i = 0; i < subs.length; i++) { System.out.print(subs[i]+" "); } } public static void main(String args[]) { String subs[] = {"Mathematics", "English", "Science", "Social"}; Student obj = new Student(); obj.setName("Krishna"); obj.setAge(25); obj.setSubs(subs); obj.display(); } }
输出结果
Name: Krishna Age :25 Subjects: Mathematics English Science Social