单项选择题
A. 3.3 B. 3.33 C. 3 D. 3.0
类Teacher: class Teacher{ String name; float salary; ...
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; D. 2000
现有: 1. interface Altitude { 2. //insert code here...
现有: 1. interface Altitude { 2. //insert code here 3. } 和4个声明: int HIGH = 7; public int HIGH = 7; abstract int HIGH = 7; interface int HIGH = 7; 分别插入到第2行,有多少行可以编译?()
A. 0 B. 1 C. 2 D. 3 E. 4
现有: class Parser extends Utils { public static void...
现有: class Parser extends Utils { public static void main(String [] args) { System.out.print(new Parser().getInt("42")); } int getInt(String arg) { return Integer.parseInt(arg); } } class Utils { int getInt(String arg) throws Exception { return 42; } } 结果为()
A. 42 B. 编译失败。 C. 无输出结果。 D. 运行时异常被抛出。