实例 从 Java API 导入 Java 包

import java.util.*; // import the java.util package 

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class Main {

  public static void main(String[] args) {

    Scanner myObj = new Scanner(System.in);

    String userName;

    // Enter username and press Enter

    System.out.println("Enter username"); 

    userName = myObj.nextLine();   

    System.out.println("Username is: " + userName);        

  }

}

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