String a = “ABCD”；
String b = a.toLowerCase（）；
b.replace（‘a’， ‘d’）；
b.replace（‘b’， ‘c’）；
System.out.println（b）；
What is the result？ （）
A. abcd
B. ABCD
C. dccd
D. dcba
E. Compilation fails.
F. An exception is thrown at runtime.
您可能感兴趣的试卷
你可能感兴趣的试题
A. –2
B. NaN
C. Infinity
D. Compilation fails.
E. An exception is thrown at runtime.
A. java.util.Map
B. java.util.List
C. java.util.Hashable
D. java.util.Collection
public class Test {
public static void main（String[] args） {
String str = NULL；
System.out.println（str）；
}
}
What is the result？（）
A. NULL
B. Compilation fails.
C. The code runs with no output.
D. An exception is thrown at runtime.
public class Test {
private static float[] f = new float[2]；
public static void main（String args[]） {
System.out.println（“f[0] = “ + f[0]）；
}
}
What is the result？（）
A. f[0] = 0
B. f[0] = 0.0
C. Compilation fails.
D. An exception is thrown at runtime.
A. 0 ... 32767
B. 0 ... 65535
C. –256 ... 255
D. –32768 ... 32767
E. Range is platform dependent.
A. If the hashCode values are different， the objects might be equal.
B. If the hashCode values are the same， the object must be equal.
C. If the hashCode values are the same， the objects might be equal.
D. If the hashCode values are different， the objects must be unequal.
A. run
B. import
C. default
D. implement
11. public static void main（String[] args） {
12. Object obj = new Object（） {
13. public int hashCode（） {
14. returns 42；
15. }
16. }；
17. System.out.println（obj.hashCode（））；
18. }
What is the result？ （）
A. 42
B. An exception is thrown at runtime.
C. Compilation fails because of an error on line 12.
D. Compilation fails because of an error on line 16.
E. Compilation fails because of an error on line 17.
A. void run（）
B. public void run（）
C. public void start（）
D. void run（int priority）
E. public void run（int priority）
F. public void start（int priority）
public class Test {
public static void main（ String[] args） {
String foo = args[1]；
String bar = args[2]；
String baz = args[3]；
System.out.println（“baz = “ + baz）；
}
}
And the command line invocation： java Test red green blue
What is the result？（）
A. baz =
B. baz = null
C. baz = blue
D. Compilation fails.
E. An exception is thrown at runtime.
最新试题
Which three will compile and run without exception？（）
Which two are possible results？（）
A programmer is developing a class Key， that will be used as a key in a standard java.util.HashMap. Which two methods should be overridden to assure that Key works correctly as a key？（）
What is the result？（）
What is the result？（）
Which two of statements are true？（）
What is the appropriate definition of the hashCode method in class Person？（）
What is the result？（）
Given a class whose instances， when found in a collection of objects， are sorted by using the compareTo（） method， which two statements are true？（）
Which statement is true about the set variable on line 12？（）