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 2 years ago

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