如何在Java中没有任何内置方法的情况下从字符串中删除字符我不想使用stringbuilder或字符串缓冲区

Question

Can anyone tell me how to remove character from string without any use of built-in functions and stringbuffer or builder. Although I tried to form a logic but didn't get the answer. As in below code I want to remove 'he' from the inputstring.

import java.util.Scanner;
public class p1 {
    public static void main(String[] rgs) {
        System.out.println("enter the string");
        Scanner s = new Scanner(System. in );
        String str = s.nextLine();
        p1 g = new p1();
        g.replacechar(str);
    }
    public void replacechar(String str) {
        String e = "";
        int l = str.length();
        char ch[] = str.toCharArray();
        for (int i = 0; i < l; i++) {
            if (ch[i] == 'h' && ch[i + 1] == 'e') {
                ch[i] = ' ';
                ch[i + 1] = ' ';
                e += ch[i];
            } else {
                System.out.println("no ");
                break;
            }
        }
        System.out.println(e);
    }
}

Answer 1

Your question is not very clear, but may be what you want is(just modified your code) :

for(int i = 0 ; i < ch.length ; i++)
{
    if (ch[i] == 'h' && ch[i+1] == 'e')
    {
       ch[i] = ' ';
       ch[i + 1] = ' ';
       i = i +2;
    }
    else
    {
       e +=ch[i];
    }
}

Input : "My he is"

Output : "My is"

Answer 2

你可以用这个（我一直在用这个：））：

Str.replace('he', '');

Answer 3

With not using any build in function.

import java.util.Scanner;
public class replacechar {
       String line;
       String s = "";
       char from ;
       char to ;
       public replacechar()
       {
           Scanner scan = new Scanner(System.in);
           System.out.println("Enter The String");
           line = scan.nextLine();
           System.out.println("Enter The Character you want to changer");
           from = scan.nextLine().charAt(0);
           System.out.println("Enter the Character you want to replace with");
           to = scan.nextLine().charAt(0);
           replacecharacter(from,to);
       }
       public void replacecharacter(char f,char t)
       {
           for(int i =0;i< line.length();i++)
           {

               if(line.charAt(i) == f)
               {
                  s += t;
               }
               else
               {
                   s += line.charAt(i);
               }

           }
           System.out.println(s);
       }
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        replacechar  obj = new replacechar();
    }

}

Answer 4

public static void main(String[] args) {
    String input="my he is";
    String output="";
    String c="he";
    String[] split = input.split(c);
    for(int i=0;i<(split.length);i++)
    {
    output=output.concat(split[i])  ;
    }
    System.out.println(output);
}

split will work fine hr

Answer 5

we can convert a String toCharArray and check current character is which we want to remove or not if the character is not which we want to remove then we will add to the new String else we wont add to the String

String str = "hello";
String s = "";
char charToRemove = 'h';
char[]ar = str.toCharArray();
for(int i=0;i<ar.length;i++) {
    if(ar[i]!=charToRemove) 
        s+=ar[i];
}   
    System.out.println(s);