java写出1+...+n=sum的值

package name8;import java.util.Scanner;public class jia2 {public static void main(String[] args) {int i=1,sum=0,n;System.out.println("请输入n：");Scanner scan =new Scanner(System.in);n=scan.nextInt();while(i<=n){System.out.print(i+(i==n?"=":"+"));sum=i+sum;i++;}System.out.print(sum);}}

package name8;import java.util.Scanner;public class jia {public static void main(String[] args) {int i,sum=0,n;System.out.println("请输入n：");Scanner scan =new Scanner(System.in);n=scan.nextInt();for(i=1;i<n;i++){System.out.print(i+"+");sum=i+sum;}System.out.print(n+"=");sum=sum+n;System.out.print(sum);}}