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SCJP题
来源: 互联网 发布时间:2015-05-14
本文导语: 1.public class SyncTest{ private int x; private int y; private Synchronized void setX(int i){x=i;} private Synchronized void setY(int i){y=i;} public void setXY(int i){ setX(i); setY(i); } ...
1.public class SyncTest{
private int x;
private int y;
private Synchronized void setX(int i){x=i;}
private Synchronized void setY(int i){y=i;}
public void setXY(int i){
setX(i);
setY(i);
}
public Synchronized boolean check(){
return x!=y;
}
}
what is return of check()?
A.check() can never return true.
B.check() can return true when setXY is callled by multiple threads.
C.check() can return true when multiple threads call setX and setY separately.
D.check() can only return true if SychTest is changed allow x and y to be set separately.
2.public class SychTest{
private int x;
private int y;
public void setX(int i){ x=i;}
public void setY(int i){y=i;}
public Synchronized void setXY(int i){
setX(i);
setY(i);
}
public Synchronized boolean check(){
return x!=y;
}
}
Under which conditions will check() return true when called from a different class?
A.check() can never return true.
B.check() can return true when setXY is callled by multiple threads.
C.check() can return true when multiple threads call setX and setY separately.
D.check() can only return true if SychTest is changed allow x and y to be set separately
请问一下这两题的D对吗?能不能说明一下原因。
本人不会在乎分的,只要你说的对。还可以加分
private int x;
private int y;
private Synchronized void setX(int i){x=i;}
private Synchronized void setY(int i){y=i;}
public void setXY(int i){
setX(i);
setY(i);
}
public Synchronized boolean check(){
return x!=y;
}
}
what is return of check()?
A.check() can never return true.
B.check() can return true when setXY is callled by multiple threads.
C.check() can return true when multiple threads call setX and setY separately.
D.check() can only return true if SychTest is changed allow x and y to be set separately.
2.public class SychTest{
private int x;
private int y;
public void setX(int i){ x=i;}
public void setY(int i){y=i;}
public Synchronized void setXY(int i){
setX(i);
setY(i);
}
public Synchronized boolean check(){
return x!=y;
}
}
Under which conditions will check() return true when called from a different class?
A.check() can never return true.
B.check() can return true when setXY is callled by multiple threads.
C.check() can return true when multiple threads call setX and setY separately.
D.check() can only return true if SychTest is changed allow x and y to be set separately
请问一下这两题的D对吗?能不能说明一下原因。
本人不会在乎分的,只要你说的对。还可以加分
|
1 b
2 bc
D不对的原因是D和其他答案相互排斥(如果我没翻译错的话)
ABC中有对的D就不会的
2 bc
D不对的原因是D和其他答案相互排斥(如果我没翻译错的话)
ABC中有对的D就不会的
|
1.B
2.A,C,D
2.A,C,D
|
1 bc
2 c
D 错在那个“only”
2 c
D 错在那个“only”
|
1.b notition private modifier c isn't the right ,d is wrong.
2.c
2.c
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