【单选题】下面的代码合法的是 : ( ) A) public abstract method(); B) public abstract void method(); C) public abstract void method() { } ; D) public void method() implements abstract;
【简答题】The laptop is a machine which can be a mobile office;it can be used to entertain us and people can play computer s on them. One machine can perform many tasks at the same time. As technology grows...