在不使用length属性的情况下计算数组的长度

Question

I want that as soon as my exception is raised it breaks my loop(using break function) & print i(length of array)

class Length{  
  static void length(String p){ 

    int i=0;
    try{
       while(i<=i){
         char ch=p.charAt(i);
         i++;
         System.out.println(ch);
    }


  }
  catch(Exception e){
     System.out.println(e);
  }

}
  public static void main(String s[]){ 

     String a=new String("jack");
     length(a);
  }
}

Answer 1

You can change your code as follows

static int length(String p) {
    int i = 0;
    try {
        while (i <= i) {
            char ch = p.charAt(i);
            i++;
        }
    } catch (StringIndexOutOfBoundsException e) { // catch specific exception
      // exception caught here
    }
    return i; // now i is the length 
}


public static void main(String s[]) {
    String a = "jack";
    System.out.println(length(a));
}

Out put:

4

Answer 2

class Length{  
  static void length(String p){ 

    int i=0;
    try{
       while(i<=i){
         char ch=p.charAt(i);
         i++;
         System.out.println(ch);
    }


  }
  catch(Exception e){
     System.out.println("String length is  : + " i)
    // System.out.println(e);
  }

}
  public static void main(String s[]){ 

     String a=new String("jack");
     length(a);
  }
}

Answer 3

I think you need to return the length() you calculate, and you could use the for-each operator on the String by iterating the char (s) from toCharArray() with something like

static int length(String p){ 
    if (p == null) return 0;
    int count = 0;
    for (char ch : p.toCharArray()) {
        count++;
    }
    return count;
}

Answer 4

Try following application to find out the length of a word

public class Length {

public static void main(String[] args) {
    new Length().length("Jack");

}

private void length(String word){
    int i = 0;
    char []arr = word.toCharArray();
    for(char c : arr){
        i++;
    }
    System.out.println("Length of the "+ word+ " is "+ i);
}

}