单项选择题
class super {
public int getLength() {return 4;}
}
public class Sub extends Super {
public long getLength() {return 5;}
public static void main (String[]args) {
super sooper = new Super ();
Sub sub = new Sub();
System.out.printIn(
sooper.getLength()+ “,” + sub.getLength() };
}
What is the output?()
A. 4, 4
B. 4, 5
C. 5, 4
D. 5, 5
E. The code will not compile.
相关考题
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多项选择题
Whichtwostatementsaretrueregardingthecreationofadefaultconstructor?()
A. The default constructor initializes method variables.
B. The compiler always creates a default constructor for every class.
C. The default constructor invokes the no-parameter constructor of the superclass.
D. The default constructor initializes the instance variables declared in the class.
E. When a class has only constructors with parameters, the compiler does not create a default constructor. -
单项选择题
1. public class ArrayTest { 2. public static void main (String[]args) { 3. float f1[], f2[]; 4. f1 = new float [10]; 5. f2 = f1; 6. System.out.printIn (“f2[0]=” + f2[0]); 7. } 8. } What is the result?()
A. It prints f2[0] = 0.0
B. It prints f2[0] = NaN
C. An error at line 5 causes compile to fail.
D. An error at line 6 causes compile to fail.
E. An error at line 6 causes an exception at runtime. -
单项选择题
ClassOne.java 1. package com.abc.pkg1; 2. public class ClassOne { 3. private char var = ‘a’; 4. char getVar() {return var;} 5. } ClassTest.java 1. package com.abc.pkg2; 2. import com.abc.pkg1.ClassOne; 3. public class ClassTest extends ClassOne { 4. public static void main(String[]args) { 5. char a = new ClassOne().getVar(); 6. char b = new ClassTest().getVar(); 7. } 8. } What is the result?()
A. Compilation will fail.
B. Compilation succeeds and no exceptions are thrown.
C. Compilation succeeds but an exception is thrown at line 5 in ClassTest.java.
D. Compilation succeeds but an exception is thrown at line 6 in ClassTest.java.
