doublesum.java

用netbean编写的变位词检测程序实验和计算多个实数的和实验

/**
 * 实验7-题目4:计算多个实数的和
 */
import java.util.Scanner;
import javax.swing.JOptionPane;

public class DoubleSum{
    public static double sum(){
        double sum = 0;
        String str = JOptionPane.showInputDialog(null, "输入多个用空格实数:");
                                 
        Scanner scanner = new Scanner(str);
        
        while(scanner.hasNext()){
            sum += scanner.nextDouble();
        }
        
        return sum;
    }
    
    public static double sum(String str){
        double sum = 0;
        Scanner scanner = new Scanner(str);
        
        while(scanner.hasNext()){
            sum += scanner.nextDouble();
        }
        
        return sum;
    }
    
    public static double sum(String[] strs){
        double sum = 0;
        
        for(int i = 0; i < strs.length; i++){
            sum += Double.parseDouble(strs[i]);
        }
        
        return sum;
    }
    
    public static void main(String[] args){
        if(args.length == 0){
            System.out.println("SUM = " + sum());
        } 
        else if(args.length == 1){
            System.out.println("SUM = " + sum(args[0]));
        }
        else{
            System.out.println("SUM = " + sum(args));
        }
    }
}