int getLineNumber()
描述 (Description)
java.io.LineNumberInputStream.getLineNumber()方法返回当前行号。
声明 (Declaration)
以下是java.io.LineNumberInputStream.getLineNumber()方法的声明 -
public int getLineNumber()
参数 (Parameters)
NA
返回值 (Return Value)
该方法返回当前行号。
异常 (Exception)
NA
例子 (Example)
以下示例显示了java.io.LineNumberInputStream.getLineNumber()方法的用法。
package com.iowiki;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.LineNumberInputStream;
public class LineNumberInputStreamDemo {
public static void main(String[] args) throws IOException {
LineNumberInputStream lnis = null;
FileInputStream fis = null;
int i,j;
char c;
try {
// create new input streams
fis = new FileInputStream("C:/test.txt");
lnis = new LineNumberInputStream(fis);
// reads till the end of the stream
while((i = lnis.read())!=-1) {
// converts int to char
c = (char)i;
// if the character is not new line
if(i!=10) {
// prints char
System.out.print("Character read: "+c);
// get the line number
j = lnis.getLineNumber();
System.out.println(" at line: "+j);
}
}
} catch(Exception e) {
// if any error occurs
e.printStackTrace();
} finally {
// closes the stream and releases any system resources
if(fis!=null)
fis.close();
if(lnis!=null)
lnis.close();
}
}
}
假设我们有一个文本文件c:/test.txt ,它具有以下内容。 该文件将用作示例程序的输入 -
ABCDE
让我们编译并运行上面的程序,这将产生以下结果 -
Character read: A at line: 0
Character read: B at line: 0
Character read: C at line: 0
Character read: D at line: 0
Character read: E at line: 0
Character read: F at line: 1
Character read: G at line: 1
Character read: H at line: 1
Character read: I at line: 1
Character read: J at line: 1
Character read: K at line: 2
Character read: L at line: 2
Character read: M at line: 2
Character read: N at line: 2
Character read: O at line: 2
Character read: P at line: 3
Character read: Q at line: 3
Character read: R at line: 3
Character read: S at line: 3
Character read: T at line: 3