java编程题，问怎样输入a.b的值，在哪编写

如题所述

public class Testa {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.println("从键盘输入A的值：");
double a = scanner.nextDouble();
System.out.println("从键盘输入B的值：");
double b = scanner.nextDouble();
System.out.println("A+B="+(a+b));
}
}

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