java中，如何输出字符串1+1/2+1/3+...+1/n啊啊啊！！！

public void fun(int n){
float count=0;
for(int i=1;i<=n;i++){

float a=1.0/i;
count+=a;
if(i==1){
System.out.print("1+");
}else if(i==n){
System.out.print("1/"+n+"="+count);
}else{
System.out.print("1/"+n+"+");
}

}
}

int n=15;
double sum=0;
for (int i = 0; i <n ; i++) {
sum+=1/n;
}

double i = 15.0;
double sum = 0.0;
StringBuilder sb = new StringBuilder();
for (double j = 1; j <= i; j++) {
sum += 1/j ;
sb.append("1/"+(int)j).append("+");
}
System.out.println(sb.substring(0, sb.length()-1)+"="+sum);

public static void main(String... args) {
int n = System.in.read();
int sum = 0;
String str = "";
for(int i = 1; i <= n; i++ ) {
sum += 1/ i;
Str += " + " + i +"/" + n;
}
System.out.println(str);

}

    double sum=0;
      double a=1,b; //改成double
      String c="";
      System.out.println("请输入:");
      Scanner scan=new Scanner(System.in);
    int n=scan.nextInt();
      for(a=1;a<=n;a++)
        {
          b=a+2;
         sum=sum+a/b;
        c+=c+"+"+a+"/"+b;
         a++;
        }
      c=c.substring(1, c.length());
      System.out.println(c+"="+sum);

这是你们学校的作业吧？

还是建议你自己多敲敲

import java.util.*;

public class test{

public static void main(String[] args){
 System.out.println("please input a number:");
    Scanner input = new Scanner(System.in);
    int n = input.nextInt();
    input.close();
    double result = 0;
    StringBuffer sb = new StringBuffer();
    for (int i = 1; i <= n; i++){
        result += 1.0/i;
        if (i == n){
            sb.append("1/" + i + "=" + result);
        }else{
            sb.append("1/" + i + "+");
        }
    }
    System.out.println(sb);
}

}

import java.util.*;
public class Test {
public static void main(String[] args){
System.out.println("请输入整数(例如10)：");
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
sc.close();
double result = count(n);
for(int i = 1; i < n; i++){
System.out.print("1/"+i+"+");
}
System.out.print("1/"+n+"="+result);
}

public static double count(int n){
    double res = 0.0;
    for(int i = 1; i <= n; i++){
        res = res + 1.0/i;
    }
    return res;
}

}