<identifier>预期误差

Question

So I have some code that I am tring to compile and I keep on getting this error:

3SATSolver.java:3: <identifier> expected

Here is the code. Am I simply not seeing something?

import java.util.ArrayList;

public class 3SATSolver {

public static void main (String[] args) {
        ArrayList values = new ArrayList<Boolean> ();
        for (int i = 0; i < args.length; i++) {
            Boolean d = new Boolean (args[i].charAt(0), Integer.parseInt(args[i].substring(1)));
        }    
    }
}

Answer 1

标识符不能以Java中的数字开头。

Answer 2

From Java Language Specification

An identifier is an unlimited-length sequence of Java letters and Java digits, the first of which must be a Java letter.

You can use Character.isJavaIdentifierStart to check whether your starting letter is a valid identifier name.

char ch = '1';
boolean bool =  Character.isJavaIdentifierStart(ch);
System.out.println(bool);

Output = False