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produces a copy of its own source code

In computing, a quine is a computer program which produces a copy of its own source code as its only output.
python
# adapted from a Quine by Sean B. Palmer

print (lambda s='print (lambda s=%r: (s %% s))()': (s % s))()
x='x=%r;print(x%%x)';print(x%x)
java
public class Quine {public static void main(String[] args) {String s = "public class Quine {public static void main(String[] args) {String s = %c%s%c;System.out.printf(s, 34, s, 34);}}";System.out.printf(s, 34, s, 34);}}
public class Quine {
public static void main(String[] args) {
Character cq = (char) 34;
Character cn = (char) 10;
Character cs = (char) 92;
String s = "public class Quine {\n public static void main(String[] args) {\n Character cq = (char) 34;\n Character cn = (char) 10;\n Character cs = (char) 92;\n String s = %c%s%c;\n System.out.printf(s, cq, s.replace(cn.toString(), cs.toString() + 'n'), cq);\n }\n}";
System.out.printf(s, cq, s.replace(cn.toString(), cs.toString() + 'n'), cq);
}
}