Scanner

Scanner

package base;
​
import java.util.Scanner;
​
public class Demo5 {
    public static void main(String[] args) {
        Scanner scanner=new Scanner(System.in);
        if (scanner.hasNext()){
            String str=scanner.next();
            System.out.println(str);
        }
        scanner.close();
    }
}
//有效字符前的空格，去掉
//有效字符后的空格，结束符
​

package base;
​
import java.util.Scanner;
​
public class Demo6 {
    public static void main(String[] args) {
        Scanner scanner=new Scanner(System.in);
        if (scanner.hasNext()){
            String str=scanner.nextLine();
            System.out.println(str);
        }
        scanner.close();
    }
}
//输入回车前的所有字符
​

字符串相等

equals