📅 最后修改于: 2020-09-27 07:01:19 🧑 作者: Mango
PrintStream类提供了将数据写入另一个流的方法。 PrintStream类自动刷新数据，因此无需调用flush()方法。而且，它的方法不会抛出IOException。
让我们看一下Java.io.PrintStream类的声明：
public class PrintStream extends FilterOutputStream implements Closeable. Appendable
| Method | Description |
|---|---|
| void print(boolean b) | It prints the specified boolean value. |
| void print(char c) | It prints the specified char value. |
| void print(char[] c) | It prints the specified character array values. |
| void print(int i) | It prints the specified int value. |
| void print(long l) | It prints the specified long value. |
| void print(float f) | It prints the specified float value. |
| void print(double d) | It prints the specified double value. |
| void print(String s) | It prints the specified string value. |
| void print(Object obj) | It prints the specified object value. |
| void println(boolean b) | It prints the specified boolean value and terminates the line. |
| void println(char c) | It prints the specified char value and terminates the line. |
| void println(char[] c) | It prints the specified character array values and terminates the line. |
| void println(int i) | It prints the specified int value and terminates the line. |
| void println(long l) | It prints the specified long value and terminates the line. |
| void println(float f) | It prints the specified float value and terminates the line. |
| void println(double d) | It prints the specified double value and terminates the line. |
| void println(String s) | It prints the specified string value and terminates the line. |
| void println(Object obj) | It prints the specified object value and terminates the line. |
| void println() | It terminates the line only. |
| void printf(Object format, Object… args) | It writes the formatted string to the current stream. |
| void printf(Locale l, Object format, Object… args) | It writes the formatted string to the current stream. |
| void format(Object format, Object… args) | It writes the formatted string to the current stream using specified format. |
| void format(Locale l, Object format, Object… args) | It writes the formatted string to the current stream using specified format. |
在此示例中，我们仅打印整数和字符串值。
package com.javatpoint;
import java.io.FileOutputStream;
import java.io.PrintStream;
public class PrintStreamTest{
public static void main(String args[])throws Exception{
FileOutputStream fout=new FileOutputStream("D:\\testout.txt ");
PrintStream pout=new PrintStream(fout);
pout.println(2016);
pout.println("Hello Java");
pout.println("Welcome to Java");
pout.close();
fout.close();
System.out.println("Success?");
}
}
输出量
Success...
文本文件testout.txt的内容使用以下数据设置
2016
Hello Java
Welcome to Java
让我们看一下使用java.io.PrintStream类的printf()方法通过格式说明符打印整数值的简单示例。
class PrintStreamTest{
public static void main(String args[]){
int a=19;
System.out.printf("%d",a); //Note: out is the object of printstream
}
}
输出量
19