Line 19
The object is NOT a candidate for garbage collection.
Line 17
Line 16
Line 18
第1题:
11.publicvoidgenNumbers(){12.ArrayListnumbers=newArrayList();13.for(inti=0;i<10;i++){14.intvalue=i*((int)Math.random());15.IntegerintObj=newInteger(value);16.numbers.add(intObj);17.}18.System.out.println(numbers);19.}WhichlineofcodemarkstheearliestpointthatanobjectreferencedbyintObjbecomesacandidateforgarbagecollection?()
A.Line16
B.Line17
C.Line18
D.Line19
E.TheobjectisNOTacandidateforgarbagecollection.
第2题:
11.public void genNumbers(){ 12.ArrayList numbers=new ArrayList(); 13.for(inti=0;i<10;i++){ 14.intvalue=i*((int)Math.random()); 15.IntegerintObj=newInteger(value); 16.numbers.add(intObj); 17.} 18.System.out.println(numbers); 19.} Which line of code marks the earliest point that an object referenced by intObj becomes a candidate for garbagec ollection?()
第3题:
下列程序中,实现将封装数据类型Integer和基本数据类型int之间的转换,以及Integer,int类型和String类型之间的转换。请将程序补充完整。
程序运行结果如下:
123
456
456
public class ex7_1{
public static void main(String[]args) {
Integer intObj;
int n;
String s;
intObj = new Integer(123);
n=intObj.__________;
System.out.printin(Integer.toString(n));
s=new String("456");
intObj=Integer._________;
System.out.println(intObj.__________);
n=Integer.parseInt(s);
System.out.println(Integer.toString(n));
}
}
第4题:
11. class Converter { 12. public static void main(String[] args) { 13. Integer i = args[0]; 14. int j = 12; 15. System.out.println(”It is “ + (j==i) + “that j==i.”); 16. } 17. } What is the result when the programmer attempts to compile the code and run it with the command java Converter 12?()
第5题:
10. interface Foo { int bar(); } 11. public class Sprite { 12. public int fubar( Foo foo) { return foo.bar(); } 13. public void testFoo() { 14. fubar( 15. // insert code here 16.); 17. } 18. } Which code, inserted at line 15, allows the class Sprite to compile?()
第6题:
Given:11.publicvoidgenNumbers(){12.ArrayListnumbers=newArrayList();13.for(inti=0;i<10;i++){14.intvalue=i*((int)Math.random());15.IntegerintObj=newInteger(value);16.numbers.add(intObj);17.}18.System.out.println(numbers);19.}WhichlineofcodemarkstheearliestpointthatanobjectreferencedbyintObjbecomesacandidateforgarbagecollection?()
A.Line19
B.TheobjectisNOTacandidateforgarbagecollection.
C.Line17
D.Line16
E.Line18
第7题:
11. public static void main(String[] args) { 12. Integer i = uew Integer(1) + new Integer(2); 13. switch(i) { 14. case 3: System.out.println(”three”); break; 15. default: System.out.println(”other”); break; 16. } 17. } What is the result?()
第8题:
11.public void genNumbers(){12.ArrayList numbers=new ArrayList();13.for(inti=0;i14.intvalue=i*((int)Math.random());15.IntegerintObj=newInteger(value);16.numbers.add(intObj);17.}18.System.out.println(numbers);19.}Which line of code marks the earliest point that an object referenced by intObj becomes a candidate for garbagec ollection?()
A.Line16
B.Line17
C.Line18
D.Line19
E.The object is NOT a candidate for garbage collection.
第9题:
11. public void genNumbers() { 12. ArrayList numbers = new ArrayList(); 13. for (int i=0; i<10; i++) { 14. int value = i * ((int) Math.random()); 15. Integer intObj = new Integer(value); 16. numbers.add(intObj); 17. } 18. System.out.println(numbers); 19. } Which line of code marks the earliest point that an object referenced by intObj becomes a candidate for garbage collection?()
第10题:
1. public class Test { 2. public static String output =””; 3. 4. public static void foo(int i) { 5. try { 6. if(i==1) { 7. throw new Exception(); 8. } 9. output += “1”; 10. } 11. catch(Exception e) { 12. output += “2”; 13. return; 14. } 15. finally { 16. output += “3”;17. } 18. output += “4”; 19. } 20. 21. public static void main(String args[]) { 22. foo(0); 23. foo(1); 24. 25. }26. } What is the value of the variable output at line 23?()