多项选择题

Which statements about inheritance are true？（）

A. In Java programming language only allows single inheritance.
B. In Java programming language allows a class to implement only one interface.
C. In Java programming language a class cannot extend a class and implement a interface together.
D. In Java programming language single inheritance makes code more reliable.

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多项选择题

Which are syntactically valid statement at// point x？（）
class Person {
private int a；
public int change（int m）{
return m；
}
}
public class Teacher extends Person {
public int b；
public static void main（String arg[]）{
Person p = new Person（）；
Teacher t = new Teacher（）；
int i；
// point x
}
}

A. i = m；
B. i = b；
C. i = p.a；
D. i = p.change（30）；
E. i = t.b.

多项选择题

Which of the following fragments might cause errors？（）

A. String s = "Gone with the wind"；String t = " good "；String k = s + t；
B. String s = "Gone with the wind"；String t；t = s[3] + "one"；
C. String s = "Gone with the wind"；String standard = s.toUpperCase（）；
D. String s = "home directory"；String t = s - "directory"；

单项选择题

Which statement of assigning a long type variable to a hexadecimal value is correct？（）

A. long number = 345L；
B. long number = 0345；
C. long number = 0345L；
D. long number = 0x345L；