单项选择题X 纠错
A.3, 2, 1
B.1, 2, 3
C.Compilation fails.
D.The code runs with no output.
E.An exception is thrown at runtime.
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单项选择题
A.A,B,C
B.B,C,A
C.Compilation fails.
D.The code runs with no output
E.An exception is thrown at runtime.
单项选择题
A.Arrays.sort(s);
B.s = new TreeSet(s);
C.Collections.sort(s);
D.s = new SortedSet(s);
单项选择题
A.2,1,0
B.2,1,1
C.3,2,1
D.3,2,2
E.Compilation fails.
F.An exception is thrown at runtime.
单项选择题
A.apple pear
B.banana pear
C.apple apple
D.apple banana
E.banana banana
多项选择题
A.list.add("foo");
B.Object o = list;
C.String s = list.get(0);
D.list = new ArrayList<String>();
E.list = new ArrayList<Object>();
多项选择题
A.public class MinMax<?>{
B.public class MinMax<? extends Number>{
C.public class MinMax<N extends Object>{
D.public class MinMax<N extends Number>{
E.public class MinMax<? extends Object>{
F.public class MinMax<N extends Integer>{
单项选择题
A.0
B.1
C.2
D.3
E.4
F.Compilation fails.
G.An exception is thrown at runtime.
单项选择题
A.Compilation fails due to an error in line 23.
B.Compilation fails due to an error in line 29.
C.A ClassCastException occurs in line 29.
D.A ClassCastException occurs in line 31.
E.The value of all four objects prints in natural order.
单项选择题
A.public int compareTo(Object o){/* more code here */}
B.public int compareTo(Score other){/* more code here */}
C.public int compare(Score s1, Score s2){/* more code here */}
D.public int compare(Object o1, Object o2){/* more code here */}
单项选择题
A.The equals method does NOT properly override the Object.equals method.
B.Compilation fails because the private attribute p.name cannot be accessed in line 5.
C.To work correctly with hash-based data structures, this class must also implement the hashCode method.
D.When adding Person objects to a java.util.Set collection, the equals method in line 4 will prevent duplicates.