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  • System.out.println()的详解

    System是System类

    1 package java.lang;
    2 public final class System {
    3       public final static PrintStream out = null;
    4 }

    println()是PrintStream 类中的方法。

    package java.io;
    public class PrintStream extends FilterOutputStream
        implements Appendable, Closeable
    {
      
       protected OutputStream out;

       private BufferedWriter textOut;

        private void ensureOpen() throws IOException {
           if (out == null)
            throw new IOException("Stream closed");
        }

       
    public void println() { newLine();//换行 } public void println(boolean x) { synchronized (this) { print(x); newLine(); } } public void println(String x) { synchronized (this) { print(x); newLine(); } } public void print(boolean b) { write(b ? "true" : "false"); } public void print(Object obj) { write(String.valueOf(obj)); } private void write(String s) { try { synchronized (this) { ensureOpen(); textOut.write(s); textOut.flushBuffer(); charOut.flushBuffer(); if (autoFlush && (s.indexOf(' ') >= 0)) out.flush(); } } catch (InterruptedIOException x) { Thread.currentThread().interrupt(); } catch (IOException x) { trouble = true; } } private void newLine() { try { synchronized (this) { ensureOpen(); textOut.newLine(); textOut.flushBuffer(); charOut.flushBuffer(); if (autoFlush) out.flush(); } } catch (InterruptedIOException x) { Thread.currentThread().interrupt(); } catch (IOException x) { trouble = true; } } }
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  • 原文地址:https://www.cnblogs.com/stujike/p/9688054.html
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