﻿ Java: Multiply two integers without multiply operator

# Java Exercises: Multiply two specified integers without using the multiply operator

## Java Basic: Exercise-168 with Solution

Write a Java program to multiply two given integers without using the multiply operator(*).

Sample Solution:

Java Code:

``````import java.util.*;
public class Solution {
public static int multiply(int n1, int n2) {
int result = 0;
boolean negative_num = (n1 < 0 && n2 >= 0) || (n2 < 0 && n1 >= 0);
boolean positive_num = !negative_num;
n1 = Math.abs(n1);
for (int i = 0; i < n1; i++) {
if (negative_num && n2 > 0 || positive_num && n2 < 0)
result -= n2;
else
result += n2;
}

return result;
}

public static void main(String[] args) {
Scanner in = new Scanner(System.in);
System.out.print("Input the first number: ");
int n1 = in.nextInt();
System.out.print("Input the second number: ");
int n2 = in.nextInt();
System.out.println("\nResult: " + multiply(n1,n2));
}

}
```
```

Sample Output:

```Input the first number:  25
Input the second number:  5

Result: 125
```

Flowchart: Java Code Editor:

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﻿

## Java: Tips of the Day

Java: Anagrams

Generates all anagrams of a string.

```public static List<String> anagrams(String input) {
if (input.length() <= 2) {
return input.length() == 2
? Arrays.asList(input, input.substring(1) + input.substring(0, 1))
: Collections.singletonList(input);
}
return IntStream.range(0, input.length())
.mapToObj(i -> new SimpleEntry<>(i, input.substring(i, i + 1)))
.flatMap(entry ->
anagrams(input.substring(0, entry.getKey()) + input.substring(entry.getKey() + 1))
.stream()
.map(s -> entry.getValue() + s))
.collect(Collectors.toList());
}
```