java例程练习(用递归方法列出文件目录)

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import java.io.File;public class Test {public static void main(String[] args) {File f = new File("C:/java");listFileTree(f,0);}private static void listFileTree(File f,int level) {String preStr = "";for(int i = 0; i < level; i++) {preStr += "    ";}File[] childs = f.listFiles();for(int i = 0; i < childs.length; i++) {System.out.println(preStr + childs[i].getName());if(childs[i].isDirectory()) {listFileTree(childs[i],level + 1);}}}}