compile java online

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import java.util.*;
import java.lang.*;
import java.util.function.*;

class Rextester {

public static void main(String args[]) {
        test("Minified", s -> l(s));
        test("Readable", s -> longest(s));
    }

// Minified
    public static int l(String s){char[]a=s.replace(" ","").toCharArray();int r=0,i=0,l=a.length;for(;i<l;i++){int p=i,n=i,c=1;while(++n<l&&a[i]==a[n])c++;while(p>0&&n<l&&a[--p]==a[n++])c+=2;r=c>r?c:r;}return r;}

// Readable
    public static int longest(String input) {
        char[] chars = input.replace(" ","").toCharArray();
        int result = 0, pos = 0, length = chars.length;
        for (; pos < length; pos++) {
            int previousPos = pos, nextPos = pos, count = 1;
            while(++nextPos < length && chars[pos] == chars[nextPos]) {
                count++;
            }
            while(previousPos > 0 && nextPos < length && chars[--previousPos] == chars[nextPos++]) {
                count += 2;
            }
            result = count > result ? count : result;
        }
        return result;
    }
    
    public static void test(String name, Function<String, Integer> testFunction) {
        Map<String, Integer> tests = new HashMap<String, Integer>();
        tests.put("howdy", 1);                                    // 'h' | 'o' | 'w' | 'd' | 'y'
        tests.put("good day", 2);                                 // 'oo' | 'dd'
        tests.put("spongepowered", 3);                            // 'ere'
        tests.put("would you like a nut for a jar of tuna?", 17); // 'anutforajaroftuna'
        tests.put("radar guns are cool", 5);                      // 'radar'
        tests.put("cart track", 8);                               // 'cartrac'
        tests.put("3.14159265358979323846264338327", 5);          // '46264'
        tests.put("7.07106781186547524400844362104", 4);          // '8118'
        int passed = 0;
        for (Map.Entry<String, Integer> entry : tests.entrySet()) {
            String str = entry.getKey();
            Integer expected = entry.getValue();
            
            int actual = testFunction.apply(str);
            
            System.out.printf("longest(\"%s\") -> %d", str, actual);
            if (actual != expected) {
                System.out.printf(", expected %d%n", expected);
            } else {
                System.out.println();
                passed++;
            }
        }
        System.out.printf("%s Passed %d out of %d tests%n", name, passed, tests.size());
        System.out.println();
    }
}

[ + ] Show input
Compilation time: 0.83 sec, absolute running time: 0.24 sec, cpu time: 0.23 sec, memory peak: 38 Mb, absolute service time: 1.09 sec