错误：找不到适合 println(String,float) 的方法？ 方法 PrintStream.println(float) 不适用？

Question

I was trying to print (int, boolean, char, double) in a same println statement .

import java.util.Scanner;

class Main {
    public static void main(String args[]) {

        Scanner input = new Scanner(System.in);

        float num1 = input.nextFloat();
        float num2 = input.nextFloat();
        float num3 = input.nextFloat();
        float num4 = input.nextFloat();

        if(num1 <= 0 && num2 <= 0 && num3 <= 0 && num4 <= 0){
            float equal = num1 + num2 + num3 + num4;
            System.out.println("%.2f", equal);
        } else if(num1 <= 0 && num2 >= 0 && num3 <= 0 && num4 <= 0){
            float equal = num1 + num3 + num4;
            System.out.println("%.2f", equal);
        } else if(num1 <= 0 && num2 <= 0 && num3 >= 0 && num4 <= 0){
            float equal = num1 + num2 + num4;
            System.out.println("%.2f", equal);
        } else if(num1 <= 0 && num2 <= 0 && num3 <= 0 && num4 >= 0){
            float equal = num1 + num2 + num3;
            System.out.println("%.2f", equal);
        } else if(num1 <= 0 && num2 >= 0 && num3 >= 0 && num4 >= 0){
            float equal = num1;
            System.out.println("%.2f", equal);
        } else if(num1 >= 0 && num2 <= 0 && num3 >= 0 && num4 >= 0){
            float equal = num2;
            System.out.println("%.2f", equal);
        } else if(num1 >= 0 && num2 >= 0 && num3 <= 0 && num4 >= 0){
            float equal = num3;
            System.out.println("%.2f", equal);
        } else if(num1 >= 0 && num2 >= 0 && num3 >= 0 && num4 <= 0){
            float equal = num4;
            System.out.println("%.2f", equal);
        } else if(num1 <= 0 && num2 <= 0 && num3 >= 0 && num4 >= 0){
            float equal = num1 + num2;
            System.out.println("%.2f", equal);
        } else if(num1 <= 0 && num2 >= 0 && num3 <= 0 && num4 >= 0){
            float equal = num1 + num3;
            System.out.println("%.2f", equal);
        } else if(num1 <= 0 && num2 >= 0 && num3 >= 0 && num4 <= 0){
            float equal = num1 + num4;
            System.out.println("%.2f", equal);
        } else if(num1 >= 0 && num2 <= 0 && num3 <= 0 && num4 >= 0){
            float equal = num2 + num3;
            System.out.println("%.2f", equal);
        } else if(num1 >= 0 && num2 <= 0 && num3 >= 0 && num4 <= 0){
            float equal = num2 + num4;
            System.out.println("%.2f", equal);
        } else if(num1 >= 0 && num2 >= 0 && num3 <= 0 && num4 <= 0){
            float equal = num3 + num4;
            System.out.println("%.2f", equal);
        } else if(num1 >= 0 && num2 >= 0 && num3 >= 0 && num4 >= 0){
            float equal = 0.00;
            System.out.println("%.2f", equal);
        }
    }
}

I don't understand why this won't work. Please explain me this.

Answer 1

The type of System.out is PrintStream . There are several overeloads of the method println() , but what they all have in common is that they take either no or a single parameter.

The method you are looking for - that takes a format string and multiple values to be inserted - is PrintStream.format() :

public PrintStream format(String format, Object... args)

Writes a formatted string to this output stream using the specified format string and arguments.

Answer 2

You can use System.out.printf instead of System.out.println , using the String %.2f before of the value that you want to print, as you already did in your code:

`
if(num1 <= 0 && num2 <= 0 && num3 <= 0 && num4 <= 0){
            float equal = num1 + num2 + num3 + num4;
            System.out.printf("%.2f", equal);
        }
`