1. 아래가 돌아가도록 하시오.
main(){
Circle[] circleArr = new Circle[2];
circleArr[0] = new Circle(10);
circleArr[1] = new Circle(10);
double areas = Circle.getArrArea(circleArr);
System.out.println(areas);
}
package array;
class Circle {
private double r;
public Circle(int r) {
this.r = r;
}
public double getArea() {
return r * r * Math.PI;
}
public static double getArrArea(Circle[] cA) {
double areaSum = 0;
for (int i = 0; i < cA.length; i++) {
areaSum += cA[i].getArea();
}
return areaSum;
}
}
public class ArrayTest6 {
public static void main(String[] args) {
Circle[] circleArr = new Circle[2];
circleArr[0] = new Circle(10);
circleArr[1] = new Circle(10);
double areas = Circle.getArrArea(circleArr);
System.out.println(areas);
}
}
- 출력결과
2. 아래가 18이 나오도록 getStrArr 함수를 만드시오.
String[] strArr = new String[3];
strArr[0] = "ABCDER";
strArr[1] = "ABCDER";
strArr[3] = "ABCDER";
System.out.println(getStrArr(strArr));
public class ArrayTest6 {
public static void main(String[] args) {
String[] strArr = new String[3];
strArr[0] = "ABCDER";
strArr[1] = "ABCDER";
strArr[2] = "ABCDER";
System.out.println("문자의 총 개수는?: " + getStrArr(strArr));
}
public static int getStrArr(String[] sA) {
int csum = 0;
for (int i = 0; i < sA.length; i++) {
csum += sA[i].length();
}
return csum;
}
}
- 출력결과
3. 아래가 나오도록 Rectangle 객체를 만드시오.
Rectangle[] recArr = new Rectangle[2];
recArr[0] = new Rectangle(10,20);
recArr[1] = new Rectangle(10,30);
double areas = Rectangle.getArrArea(recArr);
System.out.println(areas);
class Rectangle {
private double w, h;
public Rectangle(double w, double h) {
this.w = w;
this.h = h;
}
public double getArea() {
return w * h;
}
public static double getArrArea(Rectangle[] rA) {
double rSum = 0;
for (int i = 0; i < rA.length; i++) {
rSum += rA[i].getArea();
} return rSum;
}
}
public class ArrayTest6 {
public static void main(String[] args) {
Rectangle[] recArr = new Rectangle[2];
recArr[0] = new Rectangle(10, 20);
recArr[1] = new Rectangle(10, 30);
double areas = Rectangle1.getArrArea(recArr);
System.out.println(areas);
}
}
- 출력결과
4. main 에서 실행된 Box[] ar = new Box[3] 대한 메모리 그림을 그리시오.
class Box {
private String conts;
Box(String cont) { this.conts = cont; }
public String toString() {
return conts;
}
}
public static void main(String[] args) {
Box[] ar = new Box[3];
ar[0] = new Box("First");
ar[1] = new Box("Second");
ar[2] = new Box("Third");
System.out.println(ar[0]);
System.out.println(ar[1]);
System.out.println(ar[2]);
}