상자 정보 (상속 super)

public class Box {

private int x;

private int y;

private int z;

private boolean empty;

 

public String toString() {

String rslt = "가로: " + x + "cm 세로: " + y + "cm 높이: " + z + "cm";

 

/*if (empty)

return rslt + "지금 박스는 비어있습니다.\n";

else

return rslt + "지금 박스에는 물건이 들어있습니다.\n";*/

 

return rslt;

  }

 

public void fillBox() {

this.empty = false;

 }

 

public void emptyBox() {

this.empty = true;

 }

 

public int getVolume() {

return x * y * z;

  }

 

public double getWeight() {

return 1.1 * getVolume();

  }

 

public Box(int x, int y, int z) {

this.x = x;

this.y = y;

this.z = z;

emptyBox();

 }

}

 

 

 

public class MaterialBox extends Box{

private String attribute;

 

public void setAttribute(String attribute) {this.attribute = attribute;};

public String getAttribute() {return attribute;};

 

public MaterialBox(int x, int y, int z, String attribute) {

super(x, y, z);

this.attribute = attribute;

 }

 

public void printInfo() {

System.out.println(toString());

System.out.println("재질: " + getAttribute());

System.out.println("부피: " + getVolume());

System.out.println("무게: " + getWeight() + "\n"); 

 }

}

 

 

public class Practice_70 {

 

public static void main(String[] args) {

MaterialBox box1 = new MaterialBox(2, 3, 4, "wood");

MaterialBox box2 = new MaterialBox(10, 5, 5, "paper");

 

System.out.println("box1의 정보입니다.");

box1.printInfo();

System.out.println("box2의 정보입니다.");

box2.printInfo(); 

 }

}

 

 

 

결과: