单项选择题
Java语言中表达式-12>>3 的结果是哪项?() (12的二进制00001100,-12的二进制11110100)
A. -4
B. -9
C. -1
D. -2
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类Teacher: class Teacher{ String name; float salary; Teacher(String name){ this.name = name; } Teacher(String name,float salary){ this.name = name; this.salary = salary; } } 执行语句Teacher t = new Teacher(“Tom”,2000.0f);后,字段salary的值是哪一项?()
A. 2000.0f
B. 0.0f
C. null;
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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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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
