Java课后题第十二章：12.12（格式化Java源代码）

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import java.io.File;
import java.io.PrintWriter;
import java.util.Scanner;

public class FormattedJavaCode {
    public static void main(String[] args) throws Exception {
        if (args.length != 1) {
            System.out.println("Usage:java FormattedJavaCode ");
            System.exit(1);
        }
        File sourceFile = new File(args[0]);
        if (!sourceFile.exists()) {
            System.out.println("Source file " + args[0] + " not exits");
            System.exit(2);
        }
        StringBuilder sb = new StringBuilder();
        Scanner input = new Scanner(sourceFile);
        while (input.hasNext()) {
            String str = input.nextLine();
            String str1 = str.trim();
            if (str1.length() > 0 && str1.charAt(0) == '{') {
                sb.append("{");
                if (str1.length() > 1)
                    sb.append("rn" + str.replace('{', ' '));
            } else
                sb.append("rn" + str);
        }
        input.close();
        PrintWriter output = new PrintWriter(sourceFile);
        output.print(sb.toString());
        output.close();
    }
}