java中String.format报错的问题

Question

刚学java，在保留小数点的过程中，使用String.format()函数始终报错

package decimalsAdd;
import java.text.DecimalFormat;

import javax.sound.sampled.AudioSystem;


public class decimalsAdd {
    public static void main(String[] args) {
        int n = 30;
        double sum = 0.0;
        
        for(int i = 1, j = 1; i <= n; i++,j *= 3) {
            sum += (double)i/(double)j;
            System.out.println(i + " " +sum);
        }
        //System.out.println("前" + n + "项之和为：" + sum);
    
        System.out.println("前" + n + "项之和为：" + String.format("asd %d", sum));
    //这里进行了其他尝试    
        System.out.println(String.format("字符串：%s", "String"));
        System.out.println(String.format("字符：%c", 'M'));
        System.out.println(String.format("布尔类型：%b", 'M'>'A'));
        System.out.println(String.format("八进制整数类型：%o", 17));
        System.out.println(String.format("十进制整数类型：%d", 17));
        System.out.println(String.format("十六进制整数类型：%x", 17));
        System.out.println(String.format("基本浮点类型：%f", 99.1));
        System.out.println(String.format("指数类型：%e", 100.111111111));
        System.out.println(String.format("十六进制浮点类型：%a", 17.111111));
        System.out.println(String.format("散列码：%h", 17));
        System.out.println(String.format("百分比类型：17%%"));
        System.out.print(String.format("换行符：%n", 17));  
    }
}
/*所有的报错信息都是：
The method format(String, Object[]) in the type String is not applicable for the arguments (String, char)
The method format(String, Object[]) in the type String is not applicable for the arguments (String, double)
The method format(String, Object[]) in the type String is not applicable for the arguments (String, int)
The method format(String, Object[]) in the type String is not applicable for the arguments (String, String)
The method format(String, Object[]) in the type String is not applicable for the arguments (String, boolean)这些类似
*/

这里是截图：

我检查String.class中format()

并没有不对，想知道问题出在哪？jdk版本是jdk-21，eclipse是23年9月的版本。

Answer 1

sum不是浮点型数据么，d%换成f%