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1. interface I1 {
2.    int process();
3. }
4. class C implements I1 {
5.     int process() {
6.         system.out.println("process of C invoked");
7.         return 1;
8.     }
9.     void display() {
10.        System.out.println("display of C invoked");
11.    }
12.}
13.public class TestC {
14.    public static void main(String... args) {
15.        C c = new C();
16.        c.process();
17.    }
18.}

Main.java:1: error: class, interface, or enum expected
1. interface I1 {
^
Main.java:2: error: illegal start of type
2.    int process();
^
Main.java:2: error: = expected
2.    int process();
      ^
Main.java:2: error: ';' expected
2.    int process();
         ^
Main.java:2: error: illegal start of type
2.    int process();
                 ^
Main.java:2: error: <identifier> expected
2.    int process();
                  ^
Main.java:2: error: = expected
2.    int process();
                   ^
Main.java:2: error: ';' expected
2.    int process();
                    ^
Main.java:4: error: class, interface, or enum expected
4. class C implements I1 {
^
Main.java:5: error: illegal start of type
5.     int process() {
^
Main.java:5: error: ';' expected
5.     int process() {
  ^
Main.java:5: error: invalid method declaration; return type required
5.     int process() {
           ^
Main.java:6: error: not a statement
6.         system.out.println("process of C invoked");
^
Main.java:6: error: ';' expected
6.         system.out.println("process of C invoked");
  ^
Main.java:7: error: not a statement
7.         return 1;
^
Main.java:7: error: ';' expected
7.         return 1;
  ^
Main.java:8: error: not a statement
8.     }
^
Main.java:8: error: ';' expected
8.     }
  ^
Main.java:9: error: illegal start of type
9.     void display() {
^
Main.java:9: error: ';' expected
9.     void display() {
  ^
Main.java:9: error: invalid method declaration; return type required
9.     void display() {
            ^
Main.java:10: error: not a statement
10.        System.out.println("display of C invoked");
^
Main.java:10: error: ';' expected
10.        System.out.println("display of C invoked");
   ^
Main.java:11: error: not a statement
11.    }
^
Main.java:11: error: ';' expected
11.    }
   ^
Main.java:12: error: illegal start of type
12.}
^
Main.java:12: error: ';' expected
12.}
   ^
Main.java:13: error: illegal start of type
13.public class TestC {
^
Main.java:13: error: <identifier> expected
13.public class TestC {
   ^
Main.java:13: error: ';' expected
13.public class TestC {
         ^
Main.java:13: error: <identifier> expected
13.public class TestC {
                     ^
Main.java:14: error: illegal start of type
14.    public static void main(String... args) {
^
Main.java:14: error: <identifier> expected
14.    public static void main(String... args) {
   ^
Main.java:14: error: ';' expected
14.    public static void main(String... args) {
             ^
Main.java:15: error: not a statement
15.        C c = new C();
^
Main.java:15: error: ';' expected
15.        C c = new C();
   ^
Main.java:16: error: not a statement
16.        c.process();
^
Main.java:16: error: ';' expected
16.        c.process();
   ^
Main.java:17: error: not a statement
17.    }
^
Main.java:17: error: ';' expected
17.    }
   ^
Main.java:18: error: illegal start of type
18.}
^
Main.java:18: error: ';' expected
18.}
   ^
Main.java:18: error: reached end of file while parsing
18.}
    ^
43 errors

Standard output is empty