A quine, a program that emits takes in no input and outputs it's own source code, written in Java.

Quine.java

public class Quine {
    static String[] lines = {
"public class Quine {",
"    static String[] lines = {",
"    };",
"    static String source(String[] lines) {",
"        char q = (char) 34;",
"        char nl = (char) 10;",
"        int edge = 2;",
"        int count = 24;",
"        StringBuffer buff = new StringBuffer();",
"        for (int i = 0; i < edge; i++) {",
"            buff.append(lines[i]).append(nl);",
"        }",
"        for (int i = 0; i < count; i++) {",
"            buff.append(q + lines[i] + q + ',').append(nl);",
"        }",
"        for (int i = edge; i < count; i++) {",
"            buff.append(lines[i]).append(nl);",
"        }",
"        return buff.toString().trim();",
"    }",
"    public static void main(String[] args) {",
"        System.out.println(source(lines));",
"    }",
"}",
    };
    static String source(String[] lines) {
        char q = (char) 34;
        char nl = (char) 10;
        int edge = 2;
        int count = 24;
        StringBuffer buff = new StringBuffer();
        for (int i = 0; i < edge; i++) {
            buff.append(lines[i]).append(nl);
        }
        for (int i = 0; i < count; i++) {
            buff.append(q + lines[i] + q + ',').append(nl);
        }
        for (int i = edge; i < count; i++) {
            buff.append(lines[i]).append(nl);
        }
        return buff.toString().trim();
    }
    public static void main(String[] args) {
        System.out.println(source(lines));
    }
}