Compiler Design(Dragon Book)

Help me write a java code:

1)Read quadruples from txt file ;

2)Change the quadruples into algrithm expressions;

3)Compute the final result.

Don't copy and paste my own code and answer!!! Don't waste my time!

Quadruple:

1(=,1,/,x) 2(=,2,/,y) 3(+,x,y,T1) 4(=,T1,/,z)

Code I have done so far(but I didn't finish? a lot problems exist, please help me, deadline is tomorrow :-(.)

package compiler;

import java.io.BufferedReader;

import java.io.File;

import java.io.FileReader;

import java.io.IOException;

public class Compute {

private static boolean isOperator(char ch) {

boolean flag = false;

if (ch == '+'|| ch == '-'|| ch == '*'|| ch == '/')

flag = true;

return flag;

}

public static int[] Compute() throws IOException{

File file = new File("C:/Users/dell-pc/Workspaces/MyEclipse 2016 CI/C-Compiler/output/Quadruple.txt");

BufferedReader br = new BufferedReader(new FileReader(file));

String s = null;

char[] expr = new char[100];

char[] temp = new char[10];

int[] val = new int[10];

int x = 0, y = 0;

while((s = br.readLine())!= null)// (op, arg1, arg2, result)

{

//System.out.println(s);

for(int i=2;i

if(s.charAt(1)=='('&&s.charAt(i)!=')'&&s.charAt(i)!='#'){//&&s.charAt(i)!=','

if(Character.isLetter(s.charAt(i))&&Character.isDigit(s.charAt(i+1))){

expr[i] = s.charAt(i);

//expr[i+1] = s.charAt(i+1);

}

expr[i] = s.charAt(i);

if(s.charAt(i)==' ')

expr[i+1] = ';';

expr[i+1] = ',';

}

}

for(int i=0;i

if(expr[i]!='\0')

System.out.print(expr[i]);

System.out.println();

for(int i=0; i

for(int j=0; j<8; j++){

int k = 0;

//if(expr[i]!=',')

if(expr[i]=='='){

if(Character.isDigit(expr[i]))

val[k] = expr[i];

if(Character.isLetter(expr[i]))

temp[k] = expr[i];

//temp[i] = val;

k++;

}

}

}

for(int i=0; i

System.out.print(temp[i]);

for(int i=0; i

System.out.print(val[i]);

for(int i=0; i

for(int j=0; j<8; j++){

if(isOperator(expr[i])){

if(expr[i]=='+')

val[i] = expr[i+2] + expr[i+4];

if(expr[i]=='-')

val[i] = expr[i+2] - expr[i+4];

if(expr[i]=='*')

val[i] = expr[i+2] * expr[i+4];

if(expr[i]=='/')

val[i] = expr[i+2] / expr[i+4];

}

}

}

}

br.close();

return val;

}

public static void main(String args[]) throws Exception {

Compute();

}

}