package base;
public class Dome01 {
public static void main(String[] args) {
//二元运算符
int a=10;
int b=20;
int c=25;
int d=25;
System.out.println(a + b);
System.out.println(a - b);
System.out.println(a * b);
System.out.println(a / (double) b);
}
}
package base;
public class Dome02 {
}
package Scanner;
import java.util.Scanner;
public class Demo01 {
public static void main(String[] args) {
//创建一个扫描器对象，用于接收键盘数据
Scanner scanner =new Scanner(System.in);
System.out.println(("使用next方式接收"));
//判断用户有没有输入字符串
if (scanner.hasNext()){
//使用next方式接收
String str = scanner.next();
System.out.println(("输出的内容为：" + str));
}//上述内容还没看懂，需要反复！
//凡是属于IO流的类如果不关闭就会一直占用资源，要养成良好的习惯用完就关掉
scanner.close();
}
}
package Scanner;
import java.util.Scanner;
public class Demo02 {
public static void main(String[] args) {
Scanner scanner =new Scanner(System.in);
System.out.println(("请输入数据:"));
String str =scanner.nextLine();
System.out.println(("请输出的内容为：" + str));
scanner.close();
}
}
