﻿ Java: Check x^2 + y^2 is equal to a given positive number

# Java Exercises: Test whether there are two integers x and y

## Java Basic: Exercise-191 with Solution

Write a Java program to test whether there are two integers x and y such that x^2 + y^2 is equal to a given positive number.

Pictorial Presentation: Sample Solution:

Java Code:

``````import java.util.*;
public class Solution {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
System.out.print("Input a positive integer: ");
int n = in.nextInt();
if (n>0)
{
System.out.print("Is "+n+" sum of two square numbers? "+sum_of_square_numbers(n));
}
}

public static boolean sum_of_square_numbers(int n) {
int left_num = 0, right_num = (int) Math.sqrt(n);
while (left_num <= right_num) {
if (left_num * left_num + right_num * right_num == n) {
return true;
} else if (left_num * left_num + right_num * right_num < n) {
left_num++;
} else {
right_num--;
}
}
return false;
}
}
```
```

Sample Output:

```Input a positive integer:  25
Is 25 sum of two square numbers? true
```

Flowchart: Java Code Editor:

Company:

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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());
}
```