How to make equal two char arrays by adding '0'? Java

Question

I got some problem. I have two char arrays (for ex. char[] number1 = {'1','1','1','1'}, and char[] number2 {'2','2'}). And now I want to return array with same length what number1 is, but in indexes on the left where add '0' (for ex. in this case => {'0','0','2','2'}

I try something like this:

public static char[] whichShorter(char[] first,char[] secend){

    if(first.length >= secend.length) return secend;
        else return first;

}

public static char[] whichLonger(char[] first,char[] secend){

    if(first.length >= secend.length) return first;
    else return secend;

}

public static char[] makeEqual(char[] first, char[] secend){
  char[] longer = whichLonger(first,secend);
  char[] shorter =  whichShorter(first, secend);
  char[] addZero = new char[longer.length];
  

    for (int i = shorter.length; i >0 ; i--) {

        addZero[i]=shorter[i-1];

    }

    for (int i = 0; i < addZero.length ; i++) {

        if(addZero[i]==(char) 0) addZero[i]='0';

    }
    
    return addZero;

}

I guess its not hard at all, but im trying hard and there no effect (I try to draw on paper first, everything).

You forgot to mention your problem with the code you've included. Make sure you include any errors or issues you're having. — Henry Twist
– Henry Twist, Commented May 2, 2021 at 12:07

Most Noble Rabbit · Accepted Answer · 2021-05-02 16:53:54Z

1

You can do:

Stream<Character> leadingZeros = IntStream.range(0, number1.length - number2.length)
        .mapToObj(i -> '0');
Stream<Character> originalChars = IntStream.range(0, number2.length)
        .mapToObj(i-> number2[i]);

Character[] newNumber2 = Stream.concat(leadingZeros, originalChars).toArray(Character[]::new);

System.out.println(Arrays.toString(newNumber2));

Input 1:

char[] number1 = {'1','1','1','1'};
char[] number2 = {'2','2'};

Output 1:

[0, 0, 2, 2]

Input 2:

char[] number1 = {'1','1','1','1'};
char[] number2 = {'2','2', '2', '2', '2'};

Output 2:

[2, 2, 2, 2, 2]

answered May 2, 2021 at 16:53

Most Noble Rabbit

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1 Comment

XXX YYY Over a year ago

thanks, I can use build in function etc, but I did it another way, but thanks a lot

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