Ikk：新頁面: 1. public abstract class Shape{ 2. private int x; 3. private int y; 4. public abstract void draw(); 5. public void setAnchor(int x, int y){ 6. this.x = x; 7. thi...

2013-03-30T07:24:14Z

新頁面: 1. public abstract class Shape{ 2. private int x; 3. private int y; 4. public abstract void draw(); 5. public void setAnchor(int x, int y){ 6. this.x = x; 7. thi...

新頁面

1. public abstract class Shape{
2. private int x;
3. private int y;
4. public abstract void draw();
5. public void setAnchor(int x, int y){
6. this.x = x;
7. this.y = y;
8. }
9. }

Which two classes use the Shape class correctly? (Choose two.)

A.
public class Circle implements Shape{
private in radius;
}

B.
public abstract class Circle extends Shape{
private in radius;
}
C.
public class Circle extends Shape{
private in radius;
public void draw();
}

D.
public abstract class Circle implements Shape{
private in radius;
public void draw();
}
E.
public class Circle extends Shape{
private in radius;
public void draw(){/* code here */}
}

F.
public abstract class Circle implements Shape{
private in radius;
public void draw(){/* code here */}
}

<div class="toccolours mw-collapsible mw-collapsed">
<span style="font-size:medium;">解答</span>

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<div class="mw-collapsible-content">
<span style="font-size: medium;">Ans: B E </span>

<span style="font-size:medium;"> 解說:
一個類別中若有抽象方法(沒有實作)，則類別必須為abstract，Circle繼承抽象類別Shape，
若Circle不為抽象類別，必須對繼承自Shape的抽象方法補上實作
使用implements必須針對介面的類別。(A/D/F錯)

</span>
</div></div>
{{SCJP 1.6版考題講解}}

SCJP 1.6版考題 050 - 修訂歷史

Ikk：新頁面: 1. public abstract class Shape{ 2. private int x; 3. private int y; 4. public abstract void draw(); 5. public void setAnchor(int x, int y){ 6. this.x = x; 7. thi...