I'm having a problem with java GUI class is not compiling, needs urgent answer

/**

*

*/

/**

* @author rrtt4

*

*/

package pckg1;

import java.util.Stack;

import java.util.StringTokenizer;

import java.awt.*;

import java.awt.event.*;

import java.time.temporal.ValueRange;

import javax.swing.*;

public class MyInfixProj{

@SuppressWarnings({ "rawtypes", "unchecked" })

public String Infix( String express, Stack operatorStack){

String Str;

String tokens = null;

//Remove space in the expression

express= express.replaceAll("\\s+","")+ "=";

String operator= "()*/ +-=";

//StringTokenizer tokens = new StringTokenizer(express,operator, true);

while(tokens.hasMoreToken()){

String[] tkn = tokens.nextToken();

if(operator.indexOf(tokens)< 0);

Stack valueStack = null;

valueStack.push(tokens);

//else

operator.push(tokens);

}

return result;

}

//Resolve Operations

//java.util.Stack valueStack;

resolve(valueStack,operatorStack);

}

}

//private void push(StringTokenizer tokens) {

// TODO Auto-generated method stu

public int getPriority(String op){

if (op.equals("(")|| op.equals(")")) {

return 0;

} else if(op.equals("*")|| op.equals("/")) {

return 2;

} else if(op.equals("=")) {

return 3;

}

return Integer.MIN_VALUE;

}

@SuppressWarnings("unchecked")

public void resolve(Stack Values,Stack operators){

while(operators.size()>=2){

String first=(String)operators.pop();

String second=(String)operators.pop();

if(getPriority(first)

operators.push(second);

operators.push(first);

return;

}

else{

String firstValue=(String)Values.pop();

String secondValue=(String)Values.pop();

Values.push(getResults(secondValue,second,firstValue));

operators.push(first);

}

}

}

private Object getResults(String secondValue, String second, String firstValue) {

// TODO Auto-generated method stub

return null;

}

public String fetResults(String operand1,String operator, String operand2){

int op1=Integer.parseInt(operand1);

int op2=Integer.parseInt(operand2);

switch (operator) {

case "*":

return ""+(op1*op2);

case "/":

return ""+(op1/op2);

case "+":

return ""+(op1+op2);

case "-":

return ""+(op1-op2);

default:

return null;

}

}

}

//----------------------

/**

*

*/

/**

* @author rrtt4

*

*/

package pckg1;

import java.util.Stack;

import java.util.StringTokenizer;

import java.awt.*;

import java.awt.event.*;

import java.time.temporal.ValueRange;

import javax.swing.*;

public class MyInfixProj{

@SuppressWarnings({ "rawtypes", "unchecked" })

public String Infix( String express, Stack operatorStack){

String Str;

String tokens = null;

//Remove space in the expression

express= express.replaceAll("\\s+","")+ "=";

String operator= "()*/ +-=";

//StringTokenizer tokens = new StringTokenizer(express,operator, true);

while(tokens.hasMoreToken()){

String[] tkn = tokens.nextToken();

if(operator.indexOf(tokens)< 0);

Stack valueStack = null;

valueStack.push(tokens);

//else

operator.push(tokens);

}

return result;

}

//Resolve Operations

//java.util.Stack valueStack;

resolve(valueStack,operatorStack);

}

}

//private void push(StringTokenizer tokens) {

// TODO Auto-generated method stu

public int getPriority(String op){

if (op.equals("(")|| op.equals(")")) {

return 0;

} else if(op.equals("*")|| op.equals("/")) {

return 2;

} else if(op.equals("=")) {

return 3;

}

return Integer.MIN_VALUE;

}

@SuppressWarnings("unchecked")

public void resolve(Stack Values,Stack operators){

while(operators.size()>=2){

String first=(String)operators.pop();

String second=(String)operators.pop();

if(getPriority(first)

operators.push(second);

operators.push(first);

return;

}

else{

String firstValue=(String)Values.pop();

String secondValue=(String)Values.pop();

Values.push(getResults(secondValue,second,firstValue));

operators.push(first);

}

}

}

private Object getResults(String secondValue, String second, String firstValue) {

// TODO Auto-generated method stub

return null;

}

public String fetResults(String operand1,String operator, String operand2){

int op1=Integer.parseInt(operand1);

int op2=Integer.parseInt(operand2);

switch (operator) {

case "*":

return ""+(op1*op2);

case "/":

return ""+(op1/op2);

case "+":

return ""+(op1+op2);

case "-":

return ""+(op1-op2);

default:

return null;

}

}

}