OnJava8-Examples/strings/UsingStringBuilder.java at master · xinan-w/OnJava8-Examples · GitHub

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// strings/UsingStringBuilder.java

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

import java.util.*;

import java.util.stream.*;

public class UsingStringBuilder {

public static String string1() {

Random rand = new Random(47);

StringBuilder result = new StringBuilder("[");

for(int i = 0; i < 25; i++) {

result.append(rand.nextInt(100));

result.append(", ");

}

result.delete(result.length()-2, result.length());

result.append("]");

return result.toString();

}

public static String string2() {

String result = new Random(47)

.ints(25, 0, 100)

.mapToObj(Integer::toString)

.collect(Collectors.joining(", "));

return "[" + result + "]";

}

public static void main(String[] args) {

System.out.println(string1());

System.out.println(string2());

}

/* Output:

[58, 55, 93, 61, 61, 29, 68, 0, 22, 7, 88, 28, 51, 89,

9, 78, 98, 61, 20, 58, 16, 40, 11, 22, 4]

[58, 55, 93, 61, 61, 29, 68, 0, 22, 7, 88, 28, 51, 89,

9, 78, 98, 61, 20, 58, 16, 40, 11, 22, 4]

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