code: package com.puppycrawl.tools.checkstyle.grammar.antlr4;
  
  import java.io.BufferedReader;
  import java.io.IOException;
  import java.io.InputStreamReader;
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  public class InputRegressionJavaClass1 {
      //comments
  
      // single-line
      /* multi on single-line */
      /* multi
       line */
      /** javadoc */
      // tab ->	<-
  
      // fields
      // modifiers
      public int f1;
      private int f2;
      protected int f3;
      int f4;
      static int f5;
      final int f6;
      volatile int f7;
      transient int f8;
      Object f9;
  
      // constructors
      static {}
      public InputRegressionJavaClass1() {f6 = 0;}
      public InputRegressionJavaClass1(int i) {this.f6 = i;}
      public InputRegressionJavaClass1(float f) {this((int)f);}
      InputRegressionJavaClass1(double a) throws Exception {f6 = 0;}
  
      // methods
      // modifiers
      native void m1();
      void m2() {}
      synchronized void m4() {}
      strictfp void m5() {}
  
      // returns
      public int[] m6() {return null;}
      public int m7() [] {return null;}
  
      // parameters
      public void m10(String p1) {}
      public void m11(final String p1) {}
      public void m12(String[] p1) {}
      public void m13(String[][] p1) {}
      public void m14(String p1, String p2) {}
      public void m15(String... p1) {}
      public void m16(String[]... p1) {}
      public void m17(int p1, String[]... p2) {}
  
      // throws
      public void m18() throws Exception {}
      public void m19() throws IOException, Exception {}
  
      // types
      public <T_$> T_$ m20() {return null;}
      public <$_T> $_T m21() {return null;}
      public <T extends Enum<T>> void m22() {}
      public <T> void m23() {};
      public <T extends RuntimeException & java.io.Serializable> void m24() {}
  
      // annotations
      @SuppressWarnings({})
      public void m50() {}
      @SuppressWarnings({"1"})
      public void m51() {}
      @SuppressWarnings({"1","2"})
      public void m52() {}
      @SuppressWarnings(value={"1"})
      public void m53() {}
      @SuppressWarnings(value={"1",})
      public void m54() {}
      @SuppressWarnings(value={"1","2"})
      public void m55() {}
      @InputRegressionJavaAnnotation1(m1="1", m2="2")
      public void m56() {}
      @ComplexAnnotation({
              @InputRegressionJavaAnnotation1(m1 = "1", m2 = ""),
              @InputRegressionJavaAnnotation1(m1 = "1", m2 = "")
      })
      public void m57() {}
      public void m58(@Deprecated String s) {}
      public void m59(final @Deprecated List l) {}
  
      // extra
      {}
      ;
  
      // instructions
      public void instructions() throws Exception {
          // used to let inputs compile
          boolean b = Math.random() > 0;
  
          // variables and types
          byte vbyte;
          boolean vboolean;
          char vchar;
          short vshort;
          int vint;
          long vlong;
          float vfloat;
          double vdouble;
          int[] varray;
          int varray2[];
          boolean test1 = true;
  
          // types
          String vstring;
          List<String> vlist;
          Map<String, String[]> vmap;
          int[] test2 = {};
          List<char[]> test3;
          Class<?> test4;
          List<? extends InputRegressionJavaClass1> test5;
          List<? extends List<Object>> test6;
          List<? extends List<List<Object>>> test7;
          List<? extends int[]> test8;
          List<? super InputRegressionJavaClass1> test9;
  
          // literals
          vboolean = true;
          vboolean = false;
          vchar = ' ';
          vchar = '"';
          vchar = '\0';
          vchar = '\'';
          vchar = '\n';
          vchar = '\r';
          vchar = '\t';
          vchar = '\b';
          vchar = '\f';
          vchar = '\"';
          vchar = '\'';
          vchar = '\\';
          vchar = '\00';
          vchar = '\013';
          vchar = '\4';
          vchar = '\40';
          vchar = '\u0000';
          vchar = '\u1234';
          vchar = '\u005C\u005C';
          vchar = '\u005c\u005c';
          vchar = '\uu005C\uuuuu005C';
          vchar = '\u005cn';
          vchar = '\u005cr';
          vchar = '\u005ct';
          vchar = '\u005cb';
          vchar = '\u005cf';
          vchar = '\u005c"';
          vchar = '\u005c'';
          vchar = '\u005c\';
          vint = 0;
          vint = -1;
          vint = +1;
          vint = 100_000;
          vint = 0x00;
          vint = 0x12345678;
          vint = 0X9;
          vint = 0x1234_5678;
          vint = 0b101;
          vint = 0B101;
          vint = 0b1;
          vint = 0b1_0;
          vint = 012345670;
          vint = 01234_5670;
          vlong = 0L;
          vlong = 1L;
          vlong = 0b1L;
          vlong = 1234567890l;
          vlong = 1234567890L;
          vlong = 0x0l;
          vlong = 0xABCDEFl;
          vlong = 0XABCDEFL;
          vfloat = 0f;
          vfloat = 0F;
          vfloat = 1.1f;
          vfloat = 1.10_1F;
          vfloat = 0_1.1_1F;
          vfloat = 1e0f;
          vfloat = 1e0F;
          vfloat = 1.0e0F;
          vfloat = 0x2__3_34.4___AFP00_00f;
          vdouble = 10.;
          vdouble = .1;
          vdouble = .1__1_1;
          vdouble = 0.0;
          vdouble = 1000.0;
          vdouble = .1d;
          vdouble = 1.D;
          vdouble = 0_1.0d;
          vdouble = 0_1.0D;
          vdouble = 4e23;
          vdouble = 4E23;
          vdouble = 4E2_3;
          vdouble = 0x0.0000000000001p-1022;
          vdouble = 0x0.0000000000001P-1022;
          vdouble = 0X0.0000000000001p+1022;
          vdouble = 0X0.0000000000001P+1022;
          vdouble = 0x.0P0;
          vdouble = 0X0p+2;
          vdouble = 0X0p+20F;
          vdouble = 0X0p+2D;
          vdouble = 0X0p+2d;
          vdouble = 0x1.P-1;
          vdouble = 0x.1___AFp1;
          vstring = null;
          vstring = "";
          vstring = "\\";
  
          // assignments and operators
          vint = 1 + 1;
          vint = 1 - 1;
          vint = 1 * 1;
          vint = 1 / 1;
          vint = 1 % 1;
          vint = 1 & 1;
          vint = 1 | 1;
          vint = 1 ^ 1;
          vint = ~1;
          vboolean = 1 != 0;
          vboolean = 1 == 0;
          vboolean = 1 > 0;
          vboolean = 1 >= 0;
          vboolean = 1 < 0;
          vboolean = 1 <= 0;
          vboolean = true && true;
          vboolean = true || true;
          vboolean = true ? true : false;
          vboolean = !true;
          vboolean = f9 instanceof Object;
          vint = 1 << 1;
          vint = 1 >> 1;
          vint = 1 >>> 1;
          vint += 1;
          vint -= 1;
          vint *= 1;
          vint /= 1;
          vint %= 1;
          vint &= 1;
          vint |= 1;
          vint ^= 1;
          vint <<= 1;
          vint >>= 1;
          vint >>>= 1;
          vint++;
          vint--;
          ++vint;
          --vint;
          String[] arrayinit = {};
          String[] arrayinit2 = {""};
          String[] arrayinit3 = {"", "",};
  
          // new
          varray = new int[]{};
          varray = new int[]{0};
          varray = new int[]{0, 1};
          varray = new int[5];
          vlist = new ArrayList<String>();
          vmap = new HashMap<String, String[]>();
          Object anonymous = new InputRegressionJavaClass1() {};
  
          // statements
          ;
          this.f1 = 0;
  
          // labels
          test_label1:
  
          // blocks
          {}
          if (true) ;
          if (true) {}
          if (true) {} else ;
          if (true) {} else {}
          if (b) { for (;;) ; }
          if (b) { for (;;) {} }
          for (int i = 0; i < 1; i++) {}
          for (int i = 0, j = 0; i < 1; i++, j += 2) {}
          for (int value: new int[]{}) ;
          for (String s : new String[]{}) ;
          for (final String s : new String[]{}) ;
          if (b) { while (true) ; }
          if (b) { while (true) {} }
          do {} while (false);
          synchronized (f9) {}
  
          switch (0) {
              case 1:
              case 0: break;
              default: break;
          }
  
          try {
              if (b) { throw new IOException(); }
              if (b) { throw new ArrayIndexOutOfBoundsException(); }
              throw new Exception();
          } catch (IOException | ArrayIndexOutOfBoundsException e) {
          } catch (Exception e) {
          } finally {}
          try (BufferedReader br = new BufferedReader(new InputStreamReader(null, "utf-8"))) {}
          try (BufferedReader br1 = new BufferedReader(new InputStreamReader(null, "utf-8"));
                  BufferedReader br2 = new BufferedReader(new InputStreamReader(null, "utf-8"));) {}
  
          // access
          test4 = InputRegressionJavaClass1.class;
          test4 = List[].class;
          test4 = boolean[].class;
          varray[0] = 0;
          for (String[] s : new String[][]{{}}) ;
          for (Map.Entry<String, String[]> e : vmap.entrySet()) { }
  
          // others
          for (;;) {break;}
          test_label2:
          for (;;) {break test_label2;}
          if (b) { for (;;) {continue;} }
          if (b) { test_label3: for (;;) {continue test_label3;} }
          if (false) return;
          if (false) throw new Exception();
          assert(false);
          assert true : "false";
          f9 = (Object) f9;
          f9.equals(((vstring = "")));
          for (int i = 0; ((i) < (6+6)); i++) ;
          if ((b & b)) {}
  
          // ast error handling
          vint = vboolean ? (vint = 1) : (vint = 0);
          varray[vint] = Integer.parseInt("0");
      }
  
      public @interface innerAnnotation {}
  }
  