2021年新华信国际信息咨询JAVA工程师笔试题
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新华信国际信息咨询JAVA工程师笔试题
选择题
1:Which statement about the garbage collection mechani ___ are true?
A.Garbage collection require additional programe code in cases where multiple threads are running.
B.The programmer can indicate that a referen ___ through a local variable is no longer of interest.
C.The programmer has a mechani ___ that explicity and immediately frees the memory used by Java objects.
D.The garbage collection mechani ___ can free the memory used by Java Object at explection time.
2:
Given:
1. public class test (
2. public static void ___in (String args[]) {
3. int i = 0xFFFFFFF1;
4. int j = ~i;
5.
6. }
7. )
What is the deci ___l value of j at line 5? Given:
1. public class test (
2. public static void ___in (String args[]) {
3. int i = 0xFFFFFFF1;
4. int j = ~i;
5.
6. }
7. )
What is the deci ___l value of j at line 5?
A.0
B.1
C.14
D.-15
3:
program?
class Mystery{
String s;
public static void ___in(String[] args){ Mystery m=new Mystery();
m.go();
void Mystery(){
s=”constructor”;
void go(){
System.out.println(s);
program?
class Mystery{
String s;
public static void ___in(String[] args){
Mystery m=new Mystery();
m.go();
void Mystery(){
s=”constructor”;
void go(){
System.out.println(s);
A.this code pliles but throws an ex ___ption at runtime
B.this code runs but nothing appears in the standard output
C.this code runs and “constructor” in the standard output
D.this code runs and writes ”null” in the standard output
4:
public class X{
public Object m(){
Object o = new Float(3.14F);//line 3
Object [] oa = new Object[1];//line 4
oa[0] = o;//line 5
o=null;//line 6
return oa[0];//line 7
When is the Float object, created in line 3,eligible for garbage collection?
public class X{
public Object m(){
Object o = new Float(3.14F);//line 3
Object [] oa = new Object[1];//line 4
oa[0] = o;//line 5
o=null;//line 6
return oa[0];//line 7
When is the Float object, created in line 3,eligible for garbage collection?
A.just after line 5.
B.just after line 6
C.just after line 7(that is,as the method returns)
D.never in this method
5:
下述程序代码中有语法错误的行是( )。
int i,ia[10],ib[10]; /*第一行*/
for (i=0;i<=9;i++) /*第2行*/
ia[i]=0; /*第3行*/
ib=ia; /*第4行*/
下述程序代码中有语法错误的行是( )。
int i,ia[10],ib[10]; /*第一行*/ for (i=0;i<=9;i++) /*第2行*/
ia[i]=0; /*第3行*/
ib=ia; /*第4行*/
A.第1行
B.第2行
C.第3行
D.第4行
6:
public class OuterClass {
private double d1 = 1.0;
//insert code here
You need to insert an inner class declaration at line 3. Which two inner class declarations are
valid?
public class OuterClass {
private double d1 = 1.0;
//insert code here
You need to insert an inner class declaration at line 3. Which two inner class declarations are
valid?
A.class InnerOne{ public static double methoda() {return
d1;} }
B.public class InnerOne{ static double methoda() {return
d1;} }
C.private class InnerOne{ double methoda() {return d1;} }
D.static class InnerOne{ protected double methoda() {return d1;} }
7:假定a和b为int型变量,则执行下述语句组后,b的值为
a=1;
b=10;
do
b-=a;
a++;
} while (b--<0);
A.9
B.-2
C.-1
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