Print character multiple times

问题

How can I print a character multiple times in a single line? This means I cannot use a loop.

I'm trying to print " _" multiple times.

I tried this method but it's not working:

System.out.println (" _" , s);

s is the variable.

回答1:

You can print in the same line with System.out.print(" _"); so you can use a loop. print instead of println does not append a new line character.

for (int i=0; i<5; i++){
    System.out.print(" _");
}

Will print: _ _ _ _ _.

回答2:

If you can use external libraries, StringUtils.repeat sounds perfect for you:

int s = 5;
System.out.println(StringUtils.repeat('_', s));

EDIT:
To answer the question in the comments - StringUtils.repeat takes two parameters - the char you want to repeat and the number of times you want it, and returns a String composed of that repetition. So, in the example above, it will return a string of five underscores, _____.

回答3:

You can use the new Stream API to achieve that. There always be an iteration behind the scenes, but this is one possible implementation.

Stream.generate(() -> " _").limit(5).forEach(System.out::print); // _ _ _ _ _

回答4:

With one call to print/println, and using your variable "s":

System.out.println(Stream.generate(() -> " _").limit(s).collect(Collectors.joining()))

回答5:

There isn't a shortcut like what you've posted...

And what do you mean "In a single line"?

If in one line of code... see Mureinik's answer

If print "_" in one line:

Instead:

Print 1 to 10 without any loop in java

    System.out.print("_");
    System.out.print("_");
    System.out.print("_");
    System.out.print("_");
    System.out.print("_");

public void recursiveMe(int n) {
    if(n <= 5) {// 5 is the max limit
        System.out.print("_");//print n
        recursiveMe(n+1);//call recursiveMe with n=n+1
    }
}
recursiveMe(1); // call the function with 1.

来源：https://stackoverflow.com/questions/27322707/print-character-multiple-times

标签

java

string

character