String loop Right shift Java algorithm __ algorithm

Enter a string, and then tell the string loop to move right 4 bits

such as input abcdefgh

The output EFGHABCD

Here are two methods, the first is to convert the string to a character array char[];

Import java.util.*;
Class move 
{public
	static void Main (string[] args) 
	{
		Scanner sc=new Scanner (system.in);
		String Str=sc.next ();
		Char[] Rt=new char[str.length ()];
		for (int i=0;i<str.length (); i++)		
		Rt[i]=str.charat (i);		
	for (int i=0;i<str.length (); i++)
	{
		if (i>str.length ()-5)
		rt[(i%4)]=str.charat (i);
		else Rt[i+4]=str.charat (i);
	}
		System.out.println (RT);
	}

Here is the second method, which uses the StringBuilder replace method to pass in the parameter start,end,replacement

Import java.util.*;
Class move 
{public
	static void Main (string[] args) 
	{
		Scanner sc=new Scanner (system.in);
		String Str=sc.next ();
		StringBuilder sb=new StringBuilder (str);
		for (int i=0;i<str.length (); i++)
		{
			if (i>str.length ()-5)
			Sb.replace (i%4, (i%4) +1,new String (new Char[]{str.charat (i)}));
		else
			sb.replace (i+4,i+5,new String (new Char[]{str.charat (i)}));
		System.out.println (SB);
	}

If you want to use the Replace method of string, it is not feasible to experiment, because the replace method of the string will only replace one part and cannot change the entire string to StringBuilder.