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JAVA19 modify the definition of the Data class [encapsulation]
topic:
answer:
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
while (scanner.hasNextInt()) {
int x = scanner.nextInt();
int y = scanner.nextInt();
Data data = new Data(x, y);
System.out.println(data.getX() + data.getY());
}
}
}
class Data {
private int x;
private int y;
public Data(int x, int y) {
this.x = x;
this.y = y;
}
public int getX() {
return x;
}
public int getY() {
return y;
}
}
JAVA20 authentication age [package]
topic:
answer:
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Person p = new Person();
Scanner scanner = new Scanner(System.in);
while (scanner.hasNextInt()) {
int age = scanner.nextInt();
p.setAge(age);
System.out.println(p.getAge());
}
}
}
class Person {
private int age;
//write your code here......
public int getAge() {
return age;
}
public void setAge(int age) {
if (age >200 ) {
this.age = 200;
} else if (age >= 0 && age <= 200) {
this.age = age;
} else if(age <0) {
this.age = 0;
}
}
}
JAVA21 Completion Constructor [Inheritance]
topic:
answer:
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
while (scanner.hasNextInt()) {
int x = scanner.nextInt();
int y = scanner.nextInt();
int z = scanner.nextInt();
Sub sub = new Sub(x, y, z);
System.out.println(sub.calculate());
}
}
}
class Base {
private int x;
private int y;
public Base(int x, int y) {
//父类构造方法
this.x = x;
this.y = y;
}
public int getX() {
return x;
}
public int getY() {
return y;
}
}
class Sub extends Base {
private int z;
public Sub(int x, int y, int z) {
//子类构造方法
super(x, y); //调用父类构造方法
this.z = z;
}
public int getZ() {
return z;
}
public int calculate() {
//子类计算三者乘积
return super.getX() * super.getY() * this.getZ();
}
}
JAVA22 rewrites calculation logic [inheritance]
topic:
answer:
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
while (scanner.hasNextInt()) {
int x = scanner.nextInt();
int y = scanner.nextInt();
Sub sub = new Sub(x, y);
sub.calculate();
}
}
}
class Base {
private int x;
private int y;
public Base(int x, int y) {
this.x = x;
this.y = y;
}
public int getX() {
return x;
}
public int getY() {
return y;
}
public void calculate() {
System.out.println(getX() * getY());
}
}
class Sub extends Base {
public Sub(int x,int y){
super(x,y);
}
public void calculate() {
if(getY()==0){
System.out.println("Error");
}else{
System.out.println(getX() / getY());
}
}