单项选择题
Given:
Which code, inserted at line 16, will cause a java.lang.ClassCastException?()
A.Alpha a = x;
B.Foo f = (Delta)x;
C.Foo f = (Alpha)x;
D.Beta b = (Beta)(Alpha)x;
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单项选择题
Given: What is the result?()
A.2
B.3
C.12
D.23 -
单项选择题
Click the Exhibit button. Which code, inserted at line 14, will allow this class to correctly serialize and deserialize?()
A.s.defaultReadObject();
B.this = s.defaultReadObject();
C.y = s.readInt(); x = s.readInt();
D.x = s.readInt(); y = s.readInt(); -
单项选择题
Given: 22.StringBuilder sb1 = new StringBuilder("123"); 23.String s1 = "123"; 24.// insert code here 25.System.out.println(sb1 + " " + s1); Which code fragment, inserted at line 24, outputs "123abc 123abc"?()
A.sb1.append("abc"); s1.append("abc");
B.sb1.append("abc"); s1.concat("abc");
C.sb1.concat("abc"); s1.append("abc");
D.sb1.concat("abc"); s1.concat("abc");
E.sb1.append("abc"); s1 = s1.concat("abc");
