Java 中的 Java.io.Printstream 类|第 2 集
原文:https://www . geesforgeks . org/Java-io-print stream-class-Java-set-2/
Java 中的 Java.io.Printstream 类|集 1 更多方法:
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PrintStream 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该输出流的便捷方法。
java Syntax :public PrintStream 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 output stream Throws: IllegalFormatException NullPointerException```java //Java program to demonstrate printf method import java.io.*; import java.util.Locale;
class PrintStreamDemo { public static void main(String[] args) { String s = "for";
// create printstream object PrintStream printStream = new PrintStream(System.out);
// illustrating printf(Locale l, String format, Object... args) method printStream.printf(Locale.US, "Geeks%sGeeks", s); } } ```
java Output: GeeksforGeeks -
PrintStream printf(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该输出流的便捷方法。
java Syntax :public PrintStream 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 output stream Throws: IllegalFormatException NullPointerException```java //Java program to demonstrate printf(String format, Object... args) method import java.io.*;
public class PrintStreamDemo { public static void main(String[] args) { String s = "for";
// create printstream object PrintStream obj= new PrintStream(System.out);
// illustrating printf(String format, Object... args) method obj.printf("Geeks%sGeeks", s); } } ```
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 //Java program to demonstrate println() methods import java.io.PrintStream;
class PrintStreamDemo { public static void main(String[] args) { PrintStream obj = new PrintStream(System.out);
//illustrating println(); obj.println("GeeksforGeeks"); } } ```
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 //Java program to demonstrate println(boolean) method import java.io.*;
class PrintStreamDemo { public static void main(String[] args) { // create printstream object PrintStream obj = new PrintStream(System.out);
//illustrating println(boolean) method obj.println(true);
// flush the stream obj.flush(); } } ```
java Output: true -
void println(char x): 打印一个字符，然后结束该行。
java Syntax :public void println(char x)```java //Java program to demonstrate println(char x) method import java.io.*;
public class PrintStreamDemo { public static void main(String[] args) { char c = 'g';
// create printstream object PrintStream obj = new PrintStream(System.out);
// illustrating println(char x) obj.println(c);
// flush the stream obj.flush();
} } ```
java Output: g -
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 //Java program to demonstrate println(char[] x) method import java.io.*;
public class PrintStreamDemo { public static void main(String[] args) { char[] c = {'G', 'E', 'E','K'};
// create printstream object PrintStream obj = new PrintStream(System.out);
// illustrating println(char[] x) obj.println(c);
// flush the stream obj.flush(); } } ```
```java Output: GEEK
```
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void println(double x): Prints a double and then terminate the line.
java Syntax :public void println(double x)```java //Java program to demonstrate println(double x) method import java.io.*;
public class PrintStreamDemo { public static void main(String[] args) { double c = 5.42762;
// create printstream object PrintStream obj = new PrintStream(System.out);
// illustrating println(double x) obj.println(c);
// flush the stream obj.flush(); } } ```
输出:
java 5.42762 -
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 PrintStreamDemo { public static void main(String[] args) { float c = 5.168502f;
// create printstream object PrintStream obj = new PrintStream(System.out);
// illustrating println(float x) obj.println(c);
// flush the stream obj.flush(); } } ```
输出:
java 5.168502f -
void println(int x): Prints an integer and then terminate the line.
java Syntax :public void println(boolean x)```java //Java program to demonstrate println(int x) method import java.io.*;
public class PrintStreamDemo { public static void main(String[] args) {
int c = 5;
// create printstream object PrintStream obj = new PrintStream(System.out);
// illustrating println(int x) obj.println(c);
// flush the stream obj.flush(); } } ```
输出:
```java 5
```
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void println(long x): Prints a long and then terminate the line.
java Syntax :public void println(long x)```java //Java program to demonstrate println(long x) method
import java.io.*; public class PrintStreamDemo { public static void main(String[] args) { long c = 123456789l; try { // create printstream object PrintStream obj= new PrintStream(System.out);
// illustrating println(long x) obj.println(c);
// flush the stream obj.flush(); } catch (Exception ex) { ex.printStackTrace(); } } } ```
输出:
java 123456789 -
void println(Object x) :Prints an Object and then terminate the line.
java Syntax :public void println(Object x)```java //Java program to demonstrate println(Object x) method import java.io.*;
public class PrintStreamDemo {
public static void main(String[] args) { // create printstream object PrintStream obj = new PrintStream(System.out);
//illustrating println(Object X) obj.println(obj);
// flush the stream obj.flush(); } } ```
输出:
java java.io.PrintStream@15db9742 -
void println(String x) :Prints a String and then terminate the line.
java Syntax :public void println(boolean x)```java import java.io.; import java.io.; //Java program to demonstrate println(String x) method public class PrintStreamDemo { public static void main(String[] args) { String c = "GeeksforGeeks";
// create printstream object PrintStream ps = new PrintStream(System.out);
// illustrating println(String x) ps.println(c);
// flush the stream ps.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 //Java program to demonstrate setError() method import java.io.*;
public class PrintStreamDemo extends PrintStream { public PrintStreamDemo(OutputStream out) { super(out); } public static void main(String[] args) { byte c[] = {65, 66, 67, 68, 69, 70, 71};
// create printstream object PrintStreamDemo obj = new PrintStreamDemo(System.out);
// illustrating write() method obj.write(c, 1, 3);
// flush the stream obj.flush();
//illustrating setError() method obj.setError(); } } ```
输出:
```java BCD
```
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void write(byte[] buf, int off, int len) :Writes len bytes from the specified byte array starting at offset off to this stream.
java Syntax :public void write(byte[] buf, int off, int len) Overrides: write in class FilterOutputStream Parameters: buf - A byte array off - Offset from which to start taking bytes len - Number of bytes to write```java //Java program to demonstrate write(int b) method import java.io.*;
public class PrintStreamDemo { public static void main(String[] args) { byte c = 65;
// create printstream object PrintStream obj = new PrintStream(System.out);
//illustrating write(int b) obj.write(c);
// flush the stream obj.flush();
} } ```
输出:
java BCD -
void write(int b) :Writes the specified byte to this stream.
java Syntax :public void write(int b) Overrides: write in class FilterOutputStream Parameters: b - The byte to be written```java //Java program to demonstrate write(int b) method import java.io.*;
public class PrintStreamDemo { public static void main(String[] args) { byte c = 65;
// create printstream object PrintStream obj = new PrintStream(System.out);
//illustrating write(int b) obj.write(c);
// flush the stream obj.flush();
} } ```
输出:
java A
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