Scanner类介绍及举例

详细的介绍见java的开发文档，本文进行几个举例：
举例代码如下，除了string类型，其他数据类型都是调用方法next+数据类型，如nextInt():

public static void main(String[] args) {
    //创建对象并初始化
    Scanner data = new Scanner(System.in);
    //整形变量
    System.out.println("please input a number：");
    int i = data.nextInt();
    System.out.println("number:" + i);

    //Double
    data = new Scanner(System.in);
    System.out.println("please input a Double：");
    double d= data.nextDouble();
    System.out.println("Double：" + d);

    //    String
    data = new Scanner(System.in);
    System.out.println("please input a     String：");
    String s= data.next();
    System.out.println("String：" + s);

    //    boolean
    data = new Scanner(System.in);
    System.out.println("please input a     boolean：");
    boolean b= data.nextBoolean();
    System.out.println("boolean：" + b);
}