오버로딩과 오버라이딩
1. 오버로딩
public void println()
public void println(boolean x)
public void println(char x)
public void println(char[] x)
public void println(double x)
public void println(float x)
public void println(int x)
public void println(long x)
public void println(Object x)
public void println(String x)public void write(byte[] b) throws IOException
public void write(byte[] b, int off, int len) throws IOException
public abstract void write(int b) throws IOException2. 오버라이딩
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