Is there a way to get separate line characters in an array to output in the console panel on one lin-CodePudding

I wrote some code in Java, but am having trouble making the character output in Console panel all on one line...

Here's the code

import java.util.ArrayList;
import java.util.List;

public class Main {
    
    public static void main(String[] args) {
        String sample = ("Hello World!");
        List<Character> colors = new ArrayList<>();
        for(int i=0;i<sample.length();i  ) {
        
        colors.add(sample.charAt(i);
        System.out.println(colors);
        }
    }
}

The out put when I run the code is like this:

[H]
[H, e]
[H, e, l]
[H, e, l, l]
[H, e, l, l, o]
[H, e, l, l, o,  ]
[H, e, l, l, o,  , W]
[H, e, l, l, o,  , W, o]
[H, e, l, l, o,  , W, o, r]
[H, e, l, l, o,  , W, o, r, l]
[H, e, l, l, o,  , W, o, r, l, d]
[H, e, l, l, o,  , W, o, r, l, d, !]

Any help greatly appreciated...

CodePudding user response：

colors is a an ArrayList, so when you're running System.out.print(colors), it uses the default toString implementation of ArrayList, which is all elements with commas between them wrapped by[].

if you want to print it as a regular sentence, you can either print it element at a time (colors.foreach(System.out::print)) or concatenate it into a string and print it

CodePudding user response：

Maybe you want

import java.util.ArrayList;
import java.util.List;

public class Main {
    
    public static void main(String[] args) {
        String sample = ("Hello World!");
        List<Character> colors = new ArrayList<>();
        for(int i=0;i<sample.length();i  ) {
        
        colors.add(sample.charAt(i);
        }

        System.out.println(colors);
    }
}

CodePudding user response：

If you don't want an array of characters to be printed as separate characters, don't use println(array). Instead, either write a loop to print each character without anything added, or convert to a String.

public class Main {    
    public static void main(String[] args) {
        String sample = ("Hello World!");
        for (int i=0; i<sample.length(); i  ) {
            System.out.print(sample.charAt(i));
        }
        System.out.println();
    }
}

The above in itself is not too useful, since you're not doing anything except taking the string apart and printing each character. But then again, I don't understand your intent. Maybe you want to print strings of increasing length?

public class Main {    
    public static void main(String[] args) {
        String sample = ("Hello World!");
        for (int i=2; i<=sample.length(); i  ) {
            System.out.println(sample.substring(0, i));
        }
    }
}

In this second example, i is the index of the first character not printed (i.e., one past the end), and since I assume you don't want a zero-length string printed, the counting starts at 2.