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Test cases

Java solution:

public class Program10 {
	public static void main(String[] args) {
		Program10.frontBack("abcd");
		Program10.frontBack("Bee");
		Program10.frontBack("MazE");
	}
	public static String frontBack(String str) {
		return str.substring(str.length()-1) + str.substring(1,str.length()-1) + str.charAt(0);
	}
}

Javascript solution:

const frontBack = (str) => {
    return str[str.length-1] + str.substring(1, str.length-1) + str[0];
}

console.log(frontBack("abcd")); //dbca
console.log(frontBack("Bee")); //eeB
console.log(frontBack("MazE")); //EazM