程序: class TestApp{ int i public static void main(String[] args){ for(int i=0;i<5;i++) System.out.print(i+1); System.out.println(i); (i沒有定義) } } 上述程序運(yùn)行后的結(jié)果是哪項?()
A. 123456 B. 123455 C. 123450 D. 編譯錯誤
A. -4 B. -9 C. -1 D. -2
類Teacher: class Teacher{ String name; float salary; Teacher(String name){ this.name = name; } Teacher(String name,float salary){ this.name = name; this.salary = salary; } } 執(zhí)行語句Teacher t = new Teacher(“Tom”,2000.0f);后,字段salary的值是哪一項?()
A. 2000.0f B. 0.0f C. null; D. 2000