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Commit 2d8e6c3e by 傅伟强-富德
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Update Test.java

1 parent 9b4b6042
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src/Test.java
import java.io.BufferedReader; import java.io.BufferedReader;
import java.io.BufferedWriter; import java.io.BufferedWriter;
import java.io.File; import java.io.File;
import java.io.FileInputStream; import java.io.FileInputStream;
import java.io.FileNotFoundException; import java.io.FileNotFoundException;
import java.io.FileWriter; import java.io.FileWriter;
import java.io.IOException; import java.io.IOException;
import java.io.InputStreamReader; import java.io.InputStreamReader;
public class Test { public class Test {
public static void main(String[] args) { public static void main(String[] args) {
test1(); test1();
} }
public static void test1(){ public static void test1(){
String param="1225sddfh"; String param="1225sddfh";
System.out.println(param.substring(0,1)); System.out.println(param.substring(0,1));
int s=param.length(); int s=param.length();
System.out.println(s); System.out.println(s);
} }
public static void reader() throws IOException{ public static void reader() throws IOException{
File fileName=new File("D:\\test.txt"); File fileName=new File("D:\\test.txt");
try { try {
fileName.createNewFile(); fileName.createNewFile();
BufferedWriter bWriter=new BufferedWriter(new FileWriter(fileName)); BufferedWriter bWriter=new BufferedWriter(new FileWriter(fileName));
bWriter.write("哈哈哈哈"); bWriter.write("哈哈哈哈呵呵呵呵");
bWriter.flush(); bWriter.flush();
bWriter.close(); bWriter.close();
} catch (IOException e) { } catch (IOException e) {
// TODO Auto-generated catch block // TODO Auto-generated catch block
e.printStackTrace(); e.printStackTrace();
} }
InputStreamReader reader = new InputStreamReader( InputStreamReader reader = new InputStreamReader(
new FileInputStream(fileName)); // 建立一个输入流对象reader new FileInputStream(fileName)); // 建立一个输入流对象reader
BufferedReader br = new BufferedReader(reader); // 建立一个对象，它把文件内容转成计算机能读懂的语言 BufferedReader br = new BufferedReader(reader); // 建立一个对象，它把文件内容转成计算机能读懂的语言
String line = ""; String line = "";
line = br.readLine(); line = br.readLine();
while (line != null) { while (line != null) {
line = br.readLine(); // 一次读入一行数据 line = br.readLine(); // 一次读入一行数据
} }
System.out.println(line); System.out.println(line);
} }
} }
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