Help needed with 'g' and 'z'

How do I solve the encryption & decryption with ‘g’ and ‘z’.
here’s the java program—>

import java.io.*;
class morse
{
	public static void main(String args[])throws IOException
	{
		BufferedReader kybd=new BufferedReader(new InputStreamReader(System.in));
			System.out.println("Enter 1 to encrypt or 2 to decyrpt");
			int length=3;
			char dot[]={'E',' ','B'};
			char comma[]={'Z','C','X'};
			char ques[]={'V','N','M'};
			char a[]={'#','$','%'};
			char b[]={'^','>','<'};
			char c[]={'!','@','&'};
			char d[]={'*','(',')'};
			char e[]={'`','~','-'};
			char f[]={'_','=','+'};
			char g[]={'R','T','U'};
			char h[]={'{','}','|'};
			char I[]={',','.','/'};
			char j[]={'c','z','?'};
			char k[]={'x','v','W'};
			char l[]={'n','m','b'};
			char m[]={'a','d','s'};
			char n[]={'g','h','f'};
			char o[]={'j','k','l'};
			char p[]={'"',';',':'};
			char q[]={'q','e','w'};
			char r[]={'t','y','r'};
			char s[]={'u','p','i'};
			char t[]={'1','2','o'};
			char u[]={'4','3','5'};
			char v[]={'8','7','9'};
			char w[]={'G','P','6'};
			char x[]={'A','O','Q'};
			char y[]={'S','J','I'};
			char z[]={'F','H','R'};
			char space[]={'Y','L','D','K'};
			int choice=Integer.parseInt(kybd.readLine());
			if(choice==1)
			{
				System.out.println("Enter the message to be encrypted");
			String str1=kybd.readLine();
			String str=str1.toLowerCase();
			System.out.println();
			for(int i=0;i<str1.length();i++)
			{
				if(str.charAt(i)==' ')
				{
					System.out.print(space[(int)(Math.random()*(length-0.1))]);
				}
				if(str.charAt(i)=='.')
				{
					System.out.print(dot[(int)(Math.random()*(length-0.1))]);
				}
					if(str.charAt(i)==',')
				{
					System.out.print(comma[(int)(Math.random()*(length-0.1))]);
				}
				if(str.charAt(i)=='?')
				{
					System.out.print(ques[(int)(Math.random()*(length-0.1))]);
				}
				if(str.charAt(i)=='a')
				{
					System.out.print(a[(int)(Math.random()*(length-0.1))]);
				}
					if(str.charAt(i)=='b')
				{
					System.out.print(b[(int)(Math.random()*(length-0.1))]);
				}
					if(str.charAt(i)=='c')
				{
					System.out.print(c[(int)(Math.random()*(length-0.1))]);
				}
					if(str.charAt(i)=='d')
				{
					System.out.print(d[(int)(Math.random()*(length-0.1))]);
				}
					if(str.charAt(i)=='e')
				{
					System.out.print(e[(int)(Math.random()*(length-0.1))]);
				}
					if(str.charAt(i)=='f')
				{
					System.out.print(f[(int)(Math.random()*(length-0.1))]);
				}
					if(str.charAt(i)=='g')
				{
					System.out.print(g[(int)(Math.random()*(length-0.1))]);
				}
					if(str.charAt(i)=='h')
				{
					System.out.print(h[(int)(Math.random()*(length-0.1))]);
				}
					if(str.charAt(i)=='i')
				{
					System.out.print(I[(int)(Math.random()*(length-0.1))]);
				}
					if(str.charAt(i)=='j')
				{
					System.out.print(j[(int)(Math.random()*(length-0.1))]);
				}
					if(str.charAt(i)=='k')
				{
					System.out.print(k[(int)(Math.random()*(length-0.1))]);
				}
					if(str.charAt(i)=='l')
				{
					System.out.print(l[(int)(Math.random()*(length-0.1))]);
				}
					if(str.charAt(i)=='m')
				{
					System.out.print(m[(int)(Math.random()*(length-0.1))]);
				}
					if(str.charAt(i)=='n')
				{
					System.out.print(n[(int)(Math.random()*(length-0.1))]);
				}
					if(str.charAt(i)=='o')
				{
					System.out.print(o[(int)(Math.random()*(length-0.1))]);
				}
					if(str.charAt(i)=='p')
				{
					System.out.print(p[(int)(Math.random()*(length-0.1))]);
				}
					if(str.charAt(i)=='q')
				{
					System.out.print(q[(int)(Math.random()*(length-0.1))]);
				}
					if(str.charAt(i)=='r')
				{
					System.out.print(r[(int)(Math.random()*(length-0.1))]);
				}
					if(str.charAt(i)=='s')
				{
					System.out.print(s[(int)(Math.random()*(length-0.1))]);
				}
					if(str.charAt(i)=='t')
				{
					System.out.print(t[(int)(Math.random()*(length-0.1))]);
				}
					if(str.charAt(i)=='u')
				{
					System.out.print(u[(int)(Math.random()*(length-0.1))]);
				}
					if(str.charAt(i)=='v')
				{
					System.out.print(v[(int)(Math.random()*(length-0.1))]);
				}
					if(str.charAt(i)=='w')
				{
					System.out.print(w[(int)(Math.random()*(length-0.1))]);
				}
					if(str.charAt(i)=='x')
				{
					System.out.print(x[(int)(Math.random()*(length-0.1))]);
				}
					if(str.charAt(i)=='y')
				{
					System.out.print(y[(int)(Math.random()*(length-0.1))]);
				}
					if(str.charAt(i)=='z')
				{
					System.out.print(z[(int)(Math.random()*(length-0.1))]);
				}
			}
			}
			else
			{
				System.out.println("Enter the message to be decrypted");
				String dec=kybd.readLine();
				System.out.println();
				System.out.print("      The decrypted message is---->   ' ");
				for(int i=0;i<dec.length();i++)
				{
					if((dec.charAt(i)=='E')||(dec.charAt(i)==' ')||(dec.charAt(i)=='B'))
				{
					System.out.print(".");
				}
				        if((dec.charAt(i)=='Z')||(dec.charAt(i)=='C')||(dec.charAt(i)=='X'))
				{
					System.out.print(",");
				}
				    if((dec.charAt(i)=='V')||(dec.charAt(i)=='N')||(dec.charAt(i)=='M'))
				{
					System.out.print("?");
				}
					if((dec.charAt(i)=='#')||(dec.charAt(i)=='$')||(dec.charAt(i)=='%'))
				{
					System.out.print("a");
				}
					if((dec.charAt(i)=='^')||(dec.charAt(i)=='>')||(dec.charAt(i)=='<'))
				{
					System.out.print("b");
				}
					if((dec.charAt(i)=='!')||(dec.charAt(i)=='@')||(dec.charAt(i)=='&'))
				{
					System.out.print("c");
				}
					if((dec.charAt(i)=='*')||(dec.charAt(i)=='(')||(dec.charAt(i)==')'))
				{
					System.out.print("d");
				}
					if((dec.charAt(i)=='`')||(dec.charAt(i)=='~')||(dec.charAt(i)=='-'))
				{
					System.out.print("e");
				}
					if((dec.charAt(i)=='_')||(dec.charAt(i)=='=')||(dec.charAt(i)=='+'))
				{
					System.out.print("f");
				}
					if((dec.charAt(i)=='R')||(dec.charAt(i)=='T')||(dec.charAt(i)=='U'))
				{
					System.out.print("g");
				}
					if((dec.charAt(i)=='{')||(dec.charAt(i)=='}')||(dec.charAt(i)=='|'))
				{
					System.out.print("h");
				}
					if((dec.charAt(i)==',')||(dec.charAt(i)=='.')||(dec.charAt(i)=='/'))
				{
					System.out.print("i");
				}
					if((dec.charAt(i)=='c')||(dec.charAt(i)=='z')||(dec.charAt(i)=='?'))
				{
					System.out.print("j");
				}
					if((dec.charAt(i)=='x')||(dec.charAt(i)=='v')||(dec.charAt(i)=='W'))
				{
					System.out.print("k");
				}
					if((dec.charAt(i)=='n')||(dec.charAt(i)=='m')||(dec.charAt(i)=='b'))
				{
					System.out.print("l");
				}
					if((dec.charAt(i)=='a')||(dec.charAt(i)=='d')||(dec.charAt(i)=='s'))
				{
					System.out.print("m");
				}
					if((dec.charAt(i)=='g')||(dec.charAt(i)=='h')||(dec.charAt(i)=='f'))
				{
					System.out.print("n");
				}
					if((dec.charAt(i)=='j')||(dec.charAt(i)=='k')||(dec.charAt(i)=='l'))
				{
					System.out.print("o");
				}
					if((dec.charAt(i)=='"')||(dec.charAt(i)==';')||(dec.charAt(i)==':'))
				{
					System.out.print("p");
				}
					if((dec.charAt(i)=='q')||(dec.charAt(i)=='e')||(dec.charAt(i)=='w'))
				{
					System.out.print("q");
				}
					if((dec.charAt(i)=='t')||(dec.charAt(i)=='y')||(dec.charAt(i)=='r'))
				{
					System.out.print("r");
				}
					if((dec.charAt(i)=='u')||(dec.charAt(i)=='p')||(dec.charAt(i)=='i'))
				{
					System.out.print("s");
				}
					if((dec.charAt(i)=='1')||(dec.charAt(i)=='2')||(dec.charAt(i)=='o'))
				{
					System.out.print("t");
				}
					if((dec.charAt(i)=='4')||(dec.charAt(i)=='3')||(dec.charAt(i)=='5'))
				{
					System.out.print("u");
				}
					if((dec.charAt(i)=='8')||(dec.charAt(i)=='7')||(dec.charAt(i)=='9'))
				{
					System.out.print("v");
				}
					if((dec.charAt(i)=='G')||(dec.charAt(i)=='P')||(dec.charAt(i)=='6'))
				{
					System.out.print("w");
				}
					if((dec.charAt(i)=='A')||(dec.charAt(i)=='O')||(dec.charAt(i)=='Q'))
				{
					System.out.print("x");
				}
					if((dec.charAt(i)=='S')||(dec.charAt(i)=='J')||(dec.charAt(i)=='I'))
				{
					System.out.print("y");
				}
				if((dec.charAt(i)=='F')||(dec.charAt(i)=='H')||(dec.charAt(i)=='R'))
				{
					System.out.print("z");
				}
				if((dec.charAt(i)=='Y')||(dec.charAt(i)=='L')||(dec.charAt(i)=='D')||(dec.charAt(i)=='K'))
				{
					System.out.print(" ");
				}
				}
				System.out.print(" ' ");
	}
	}
}

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