单项选择题
类Student代码如下:D
class Student{
String name;
int age;
Student(String nm){ (构造方法)
name = nm; } }
执行语句Student stu = new Student()后,字段age的值是哪项?()
A. 0
B. null
C. false
D. 编译错误
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单项选择题
现有: Public/project]class TestFoo { int x; String y; int getX() { return x; } (4,5,6是方法) String getY() { return y; } void setX(int x) { int z = 7; this.x = x; } } Private代表属性封装可以添加多少个修饰符来封装此类?()
A.2
B.3
C.4
D.5 -
单项选择题
public class Pass{ public static void main(String[]args){ int x=5; Pass p=new Pass(); p.doStuff(x); System.out.print("mainx="+x); } void doStuff(intx){ System.out.print("doStuffx="+x++); } } What is the result?()
A.Compilation fails.
B.An exception is thrown at runtime.
C.doStuff x=6 main x=6
D.doStuff x=5 main x=5
E.doStuff x=5 main x=6
F.doStuff x=6 main x=5 -
单项选择题
Given the command line java Pass2 and: public class Pass2{ public void main(String[]args){ int x=6; Pass2 p=new Pass2(); p.doStuff(x); System.out.print("mainx="+x); } void doStuff(intx){ System.out.print("doStuffx="+x++); } } What is the result?()
A.Compilation fails.
B.An exception is thrown at runtime.
C.doStuffx=6 main x=6
D.doStuffx=6 mainx =7
E.doStuffx=7 mainx =6
F.doStuffx=7 mainx =7
