______ 是Java数据库连接API。简单地说,它能完成3件事:(1)与一个数据库建立连接。(2)向数据库发送SQL语句。(3)处理数据库返回的结果。
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public ______ class People { int age; public int getAge() { returm age; } public abstract void speak(){ } }
以下程序的运行结果是______ class A{public int getNumber(int a){return a+1;}}class B extends A{public int getNumber(int a, char c){return a+2;} public static void main(String[] args) {B b=new B();System.out.println(b.getNumber(0));} }
写出以下程序的运行结果______ class Shape{public void draw(){System.out.print("draw Shape"+"**);}}class Circle extends Shape{ public void draw(){System.out.print("draw Circle"+"**");}}class Rectangle extends Shape{ public void draw(){System.out.print("draw Rectangle"+"**");}}public class A{public static void main(String[]args){Shape []s=new Shape[3];s[0]=new Shape();s[1]=new Circle();s[2]=new Rectangle();for(int i=0;i
以下程序的运行结果是______ class A{public String toString(){return 6+"";}}class B extends A{public String toString(){return super.toString()+9;}}public class Test{public static void main(String[]args) {B b=new B();System.out.println(b.toString());}}