Java 中的 Java.io.PrintWriter 类|第 2 集
原文:https://www . geesforgeks . org/Java-io-print writer-class-Java-set-2/
Java 中的 Java.io.PrintWriter 类|集 1 更多方法:
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PrintWriter printf(Locale l，String format，Object… args) : 一种使用指定的格式字符串和参数将格式化字符串写入此编写器的便捷方法。
java Syntax :public PrintWriter printf(Locale l, String format, Object... args) Parameters: l - The locale to apply during formatting. If l is null then no localization is applied. format - A format string as described in Format string syntax args - Arguments referenced by the format specifiers in the format string. Returns: This writer Throws: IllegalFormatException NullPointerException```java import java.io.*; import java.util.Locale; //Java program to demonstrate printf method public class PrintWriterDemo { public static void main(String[] args) { String s = "for";
// create PrintWriter object PrintWriter pr= new PrintWriter(System.out);
// printf this string pr.printf(Locale.CANADA, "Geeks%sGeeks", s);
// flush the stream pr.flush();
} } ```
java Output: GeeksforGeeks -
PrintWriter printf(字符串格式，Object… args) : 使用指定的格式字符串和参数将格式化字符串写入此编写器的一种方便方法。
java Syntax :public PrintWriter printf(String format, Object... args) Parameters: format - A format string as described in Format string syntax args - Arguments referenced by the format specifiers in the format string. Returns: This writer Throws: IllegalFormatException NullPointerException```java import java.io.*; //Java program to demonstrate printf(String format, Object... args) method public class PrintWriterDemo { public static void main(String[] args) { String s = "for";
// create PrintWriter object PrintWriter pr= new PrintWriter(System.out);
// printf this string pr.printf("Geeks%sGeeks", s);
// flush the stream pr.flush();
} } ```
java Output: GeeksforGeeks -
void println(): 通过写入行分隔符字符串终止当前行。
java Syntax :public void println()```java import java.io.*; //Java program to demonstrate println() method public class PrintWriterDemo { public static void main(String[] args) { String s = "GeeksforGeeks";
// create PrintWriter object PrintWriter pr= new PrintWriter(System.out);
// printf this string pr.printf("%s", s);
// flush the stream pr.flush();
} } ```
java Output: GeeksforGeeks -
void println(布尔值 x): 打印一个布尔值，然后终止该行。
java Syntax :public void println(boolean x)```java import java.io.*; //Java program to demonstrate println(boolean) method public class PrintWriterDemo { public static void main(String[] args) {
// create PrintWriter object PrintWriter pr= new PrintWriter(System.out);
// print a boolean and change line pr.println(true); pr.print("New Line");
// flush the stream pr.flush();
} } ```
java Output: true New Line -
void println(char x): 打印一个字符，然后结束该行。
java Syntax :public void println(char x)```java import java.io.*; //Java program to demonstrate println(char x) method public class PrintWriterDemo {
public static void main(String[] args) { char c = 'a';
// create PrintWriter object PrintWriter pr= new PrintWriter(System.out);
// print a char and change line pr.println(c); pr.println('b');
// flush the stream pr.flush();
} } ```
java Output: a b -
void println(char[] x): 打印一个字符数组，然后结束该行。
java Syntax :public void println(char[] x)```java import java.io.*; //Java program to demonstrate println(char[] x) method public class PrintWriterDemo { public static void main(String[] args) { char[] c = {'a', 'b', 'c'};
// create PrintWriter object PrintWriter pr= new PrintWriter(System.out);
// print an array and change line pr.println(c);
// flush the stream pr.flush();
} } ```
```java Output: abc
```
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void println(double x): Prints a double and then terminate the line.
java Syntax :public void println(double x)```java import java.io.*; //Java program to demonstrate println(double x) method public class PrintWriterDemo { public static void main(String[] args) { double c = 176.348;
// create PrintWriter object PrintWriter pr= new PrintWriter(System.out);
// print a double and change line pr.println(c);
// flush the stream pr.flush();
} } ```
输出:
java 176.348 -
void println(float x): Prints a float and then terminate the line.
java Syntax :public void println(float x)```java //Java program to demonstrate println(float x) method import java.io.*; public class PrintWriterDemo {
public static void main(String[] args) { float c = 5.76348f;
// create PrintWriter object PrintWriter pr= new PrintWriter(System.out);
// print a float and change line pr.println(c);
// flush the stream pr.flush();
} } ```
输出:
java 5.76348 -
void println(int x): Prints an integer and then terminate the line.
java Syntax :public void println(boolean x)```java import java.io.*; //Java program to demonstrate println(int x) method public class PrintWriterDemo {
public static void main(String[] args) { int c = 15;
// create PrintWriter object PrintWriter pr= new PrintWriter(System.out);
// print an integer and change line pr.println(c);
// flush the stream pr.flush();
} } ```
输出:
```java 15
```
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void println(long x): Prints a long integer and then terminate the line.
java Syntax :public void println(long x)```java import java.io.*; //Java program to demonstrate println(long x) method public class PrintWriterDemo {
public static void main(String[] args) { long c = 1252344125l; try { // create PrintWriter object PrintWriter pr= new PrintWriter(System.out);
// print a long and change line pr.println(c);
// flush the stream pr.flush();
} catch (Exception ex) { ex.printStackTrace(); } } } ```
输出:
java 1252344125 -
void println(Object x) :Prints an Object and then terminate the line.
java Syntax :public void println(Object x)```java import java.io.*; //Java program to demonstrate println(Object x) method public class PrintWriterDemo {
public static void main(String[] args) { Object c = 10;
// create PrintWriter object PrintWriter pr= new PrintWriter(System.out);
// print an object and change line pr.println(c);
// flush the stream pr.flush();
} } ```
输出:
java 10 -
void println(String x) : Prints a String and then terminate the line.
java Syntax :public void println(boolean x)```java import java.io.*; //Java program to demonstrate println(String x) method public class PrintWriterDemo {
public static void main(String[] args) { String c = "GeeksforGeeks";
// create PrintWriter object PrintWriter pr= new PrintWriter(System.out);
// print a string and change line pr.println(c);
// flush the stream pr.flush();
} } ```
输出:
java GeeksforGeeks -
protected void setError() : Sets the error state of the stream to true.
java Syntax :public void println(String x)```java import java.io.*; //Java program to demonstrate setError() method public class PrintWriterDemo extends PrintWriter {
public PrintWriterDemo(OutputStream out) { super(out); }
public static void main(String[] args) { char c[] = {70, 71, 72, 73, 74, 75, 76};
// create PrintWriter object PrintWriterDemo pr= new PrintWriterDemo(System.out);
// write char 1-3 pr.write(c, 1, 3);
// flush the stream pr.flush();
// set an internal error pr.setError(); } } ```
输出:
```java GHI
```
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void write(char [] buf, int off, int len) : Writes len char from the specified char array starting at offset off to this stream.
java Syntax :public void write(char [] buf, int off, int len) Overrides: write in class FilterOutputStream Parameters: buf - A char array off - Offset from which to start taking char len - Number of char to write```java import java.io.*; //Java program to demonstrate write() method public class PrintWriterDemo {
public static void main(String[] args) { char c[] = {70, 71, 72, 73, 74, 75, 76}; // create PrintWriter object PrintWriter pr= new PrintWriter(System.out);
// write char 1-3 pr.write(c, 1, 3);
// flush the stream pr.flush();
} } ```
输出:
java GHI -
void write(int b) : Writes the specified char to this stream.
java Syntax :public void write(int b) Overrides: write in class Writer Parameters: b - The char to be written```java import java.io.*; //Java program to demonstrate write(int b) method public class PrintWriterDemo {
public static void main(String[] args) { int c = 70;
// create PrintWriter object PrintWriter pr= new PrintWriter(System.out);
// write char c which is character F in ASCII pr.write(c);
// flush the stream pr.flush();
} } ```
输出:
java F -
空写(字符串):写字符串。
```java Syntax :public void write(String s) Parameters: s - String to be written
```
```java import java.io.*; public class PrintWriterDemo {
public static void main(String[] args) { String s = "Hello"; try {
// create a new writer PrintWriter pw = new PrintWriter(System.out);
// write strings pw.write(s); pw.write(" World");
// flush the writer pw.flush();
} catch (Exception ex) { ex.printStackTrace(); } } } ```
java Hello World -
无效写入(字符串 s，int off，int len) : 写入字符串的一部分。
```java Syntax :public void write(String s, int off, int len) Parameters: s - A String off - Offset from which to start writing characters len - Number of characters to write
```
```java import java.io.*;
public class PrintWriterDemo {
public static void main(String[] args) { String s = "Hello World"; try {
// create a new writer PrintWriter pw = new PrintWriter(System.out);
// write substrings pw.write(s, 0, 5); pw.write(s, 6, 5);
// flush the writer pw.flush();
} catch (Exception ex) { ex.printStackTrace(); } } } ```
java HelloWorld
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