4.java

java的程序题

import java.io.File; 
import java.util.Stack; 

public class MainTest { 
public static void main(String[] args) { 
File root = new File("F:/backup"); 
boolean log = false; 
int cnt = 0; 
if (root.exists() && root.isDirectory()) { 
Stack<File> stack = new Stack<File>(); 
stack.add(root); 
while (!stack.isEmpty()) { 
File dir = stack.pop(); 
File[] files = dir.listFiles(); 
for (File file : files) { 
if (file.isDirectory()) { 
stack.add(file); 
} else if (file.getName().endsWith(".jar")) { 
cnt++; 
if (log) { 
System.out.println(file.getAbsolutePath()); 
} 
} 

} 
} 
} 
System.out.println("JAR FILE COUNT: " + cnt); 
} 
}