Question for Java String[] tokens = expression.split(" "); for (String token : tokens) { if (token.equals("+")...

Question for Java

String[] tokens = expression.split(" ");

for (String token : tokens) {

if (token.equals("+") || token.equals("-")) {

while (!ops.isEmpty() && (ops.peek() == '+' || ops.peek() == '-' || ops.peek() == '*' || ops.peek() == '/')) {

applyOp(values, ops);

}

What does the for (String tokens : token) mean?

What are the different ways to write this for loop?

Expert Solution

String[] tokens = expression.split(" ");
for (String token : tokens) {
if (token.equals("+") || token.equals("-")) {
while (!ops.isEmpty() && (ops.peek() == '+' || ops.peek() == '-' || ops.peek() == '*' || ops.peek() == '/')) {
   applyOp(values, ops);
}

What does the for (String tokens : tokens) mean?
Answer:
--------
tokens is an array
so, with "for (String tokens : tokens)"
we iterate through all Strings in tokens array and variable token contains the string in tokens array

What are the different ways to write this for loop?
Answer:
---------
String token;
for (int i = 0; i < tokens.length; i++) {
    token = tokens[i];
    if (token.equals("+") || token.equals("-")) {
        while (!ops.isEmpty() && (ops.peek() == '+' || ops.peek() == '-' || ops.peek() == '*' || ops.peek() == '/')) {
           applyOp(values, ops);
    }
}

// This code is exactly as same as given code but uses a traditional for loop.

venereology answered 1 year ago

In Java: Design a class that checks if a String is made of tokens of the...

In Java: Design a class that checks if a String is made of tokens of the same data type (for this, you may only consider four data types: boolean, int, double, or char). This class has two instance variables: the String of data and its delimiter. Other than the constructor, you should include a method, checkTokens, that takes one parameter, representing the data type expected (for example, 0 could represent boolean, 1 could represent int, 2 could represent double, and...

JAVA programming language: For refrence: nextInt ( ) Scans the next token of the input as...

JAVA programming language: For refrence: nextInt ( ) Scans the next token of the input as an int. How many times does the while loop execute, if the input is 38 20 4 0? Assume a Scanner object scnr has been instantiated, and that the tokens in the input are delimited by the space character. That means there are 4 tokens in the input. int num = 2000; while (num >= 20) { //Do something num = scnr.nextInt(); } select...

In java please Question: You are given a string s. Your task is to count the...

In java please Question: You are given a string s. Your task is to count the number of ways of splitting s into three non-empty parts a, b and c (s = a + b + c) in such a way that a + b, b + c and c + a are all different strings. For s = "xzxzx", the output should be countWaysToSplit(s) = 5. Consider all the ways to split s into three non-empty parts:

* the Algorithm: * write a java program to convert infix to postfix create(OpStk) OpStk.push("#") token...

* the Algorithm: * write a java program to convert infix to postfix create(OpStk) OpStk.push("#") token = nextToken() while (token != "#") if (token is an operand) append token to postfix expression else if (token is "(") // Left paren - Start of sub-expr OpStk.push( token ) else if (token is ")") // Right paren - End of sub-expr pop operators off the stack and append to the postfix expression - stop when you've popped a "(" else (token is...

Finish the following java question: Consider the following interface: interface Duty { public String getDuty(); }...

Finish the following java question: Consider the following interface: interface Duty { public String getDuty(); } Write a class called Student which implements Duty. Class Student adds 1 data field, id, and 2 methods, getId and setId, along with a 1-argument constructor. The duty of a Student is to study 40 hours a week. Write a class called Professor which implements Duty. Class Professor adds 1 data field, name, and 2 methods, getName and setName, along with a 1-argument constructor....

JAVA question A string may use more than one type of delimiter to bracket information into...

JAVA question A string may use more than one type of delimiter to bracket information into "blocks". The primary ways to divide things up into block is by the braces { } , parentheses ( ), and brackets [ ] as delimiters. A string is considered properly delimited if each right delimiter ] } or )( is matched with a preceding left delimiter { [ ( of the same type in such a way that either the resulting blocks of...

Java question - How can the code below be modified to accept multi digit input. String...

Java question - How can the code below be modified to accept multi digit input. String e = "1+9+8"; int r = e.charAt(0)-'0'; for (int i = 1; i < e.length(); i+=2){ if (e.charAt(i) == '+'){ r += e.charAt(i+1)-'0'; } else{ r -= e.charAt(i+1)-'0'; } The only built in String methods that can be used are lowercase(), length(), and charAt(). Arrays and parseInt() cannot be used. So we want to know how we can get an answer if a...

Create a Java class named Trivia that contains three instance variables, question of type String that...

Create a Java class named Trivia that contains three instance variables, question of type String that stores the question of the trivia, answer of type String that stores the answer to the question, and points of type integer that stores the points’ value between 1 and 3 based on the difficulty of the question. Also create the following methods: getQuestion( ) – it will return the question. getAnswer( ) – it will return the answer. getPoints( ) – it will...

JAVA JAVA JAVA . I need to convert a string input to int array, for example...

JAVA JAVA JAVA . I need to convert a string input to int array, for example if user enters 12 / 27 / 2020 , I want to store each value in a separate array and add them afterwards.

Question 4: What is meant by “token money”? Question 5: What is meant by legal tender?...

Question 4: What is meant by “token money”? Question 5: What is meant by legal tender? Question 6: What are the shortcomings of a barter system? Question 7: How do chartered banks create money? Question 8: What is meant by a bank run? Question 9: What is the difference between treasury bills and bonds? Question 10: Are credit cards money? Question 11: Why are there different definitions for the Canadian money supply? Question 12: What are Chartered banks? Question 13:...

Question