Java中的编写器 append(CharSequence, int, int) 方法及示例
Java中Writer类的append(CharSequence, int, int)方法用于将指定charSequence的指定部分追加到writer上。这个 charSequence 被当作一个参数。要写入的起始索引和结束索引也作为参数。
句法:
public void append(CharSequence charSequence, int startingIndex, int endingIndex)
参数:此方法接受三个强制参数:
- charSequence是要写入 Stream 的 charSequence。
- 起始索引,它是从中获取字符部分的起始索引。
- endingIndex是要写入 writer 的结束索引。
返回值:此方法不返回任何值。
下面的方法说明了 append(CharSequence, int, int) 方法的工作:
方案一:
// Java program to demonstrate
// Writer append(CharSequence, int, int) method
import java.io.*;
class GFG {
public static void main(String[] args)
{
try {
// Create a Writer instance
Writer writer
= new PrintWriter(System.out);
// Get the charSequence
// to be written in the writer
CharSequence charSequence = "GeeksForGeeks";
// Get the starting index
int startingIndex = 0;
// Get the length of char
int endingIndex = 5;
// Write the portion of the charSequence
// to this writer using append() method
// This will put the charSequence in the writer
// till it is printed on the console
writer.append(charSequence,
startingIndex,
endingIndex);
writer.flush();
}
catch (Exception e) {
System.out.println(e);
}
}
}
输出:
Geeks
方案二:
// Java program to demonstrate
// Writer append(CharSequence, int, int) method
import java.io.*;
class GFG {
public static void main(String[] args)
{
try {
// Create a Writer instance
Writer writer
= new PrintWriter(System.out);
// Get the charSequence
// to be written in the writer
CharSequence charSequence = "GFG";
// Get the starting index
int startingIndex = 2;
// Get the length of char
int endingIndex = 3;
// Write the portion of the charSequence
// to this writer using append() method
// This will put the charSequence in the writer
// till it is printed on the console
writer.append(charSequence,
startingIndex,
endingIndex);
writer.flush();
}
catch (Exception e) {
System.out.println(e);
}
}
}
输出:
G