java零碎知识点整理

System.out.println((char)97);//a

InputStream有：read() , read(byte[] a) , read(byte[] a, int offSet ,int length)

Reader 有：read(),read(char[] a) ,read(char[] a,int offSet,int length)

OutputStream: write(int b), wirte (byte[] b),wirte(byte[] b,int offSet, int length)

Wirter 有：wirte(int b),write(char[] b),wirte(char[] b,int offSet,int length),write(String s),write(String s,int offSet,int length)

Writer类的write(String string)方法自动调用String类的 toCharArray()方法，然后调用write(char[] c)。

详情查看《尚学堂java SE学习笔记》

BufferedReader reader=new BufferedReader(new InputStreamReader(System.in));

try {

System.out.println(reader.read());

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

输入：0 则返回的是48

BufferedReader reader=new BufferedReader(new InputStreamReader(System.in));

try {

System.out.println((char)reader.read());

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

输入：0 则返回的是0