diff --git a/exec/binary_ops.mj b/exec/binary_ops.mj
new file mode 100644
index 0000000000000000000000000000000000000000..da4fac0661077e3e6075cdbe214fc70fb6494ea1
--- /dev/null
+++ b/exec/binary_ops.mj
@@ -0,0 +1,26 @@
+class A {
+    public static void main(String[] args) {
+        System.out.println(2 - 1); // 1
+        System.out.println(4 / 2); // 2
+        System.out.println(1 + 2); // 3
+        System.out.println(2 * 2); // 4
+        System.out.println(11 % 6); // 5
+
+        if (false || true) { System.out.println(6); }
+        if (true || false) { System.out.println(7); }
+        if (true && false) { } else { System.out.println(8); }
+        if (true && true) { System.out.println(9); }
+        if (1 == 1) { System.out.println(10); }
+        if (1 == 2) { } else { System.out.println(11); }
+        if (1 != 2) { System.out.println(12); }
+        if (1 != 1) { } else { System.out.println(13); }
+        if (1 < 2) { System.out.println(14); }
+        if (1 < 1) { } else { System.out.println(15); }
+        if (2 > 1) { System.out.println(16); }
+        if (1 > 1) { } else { System.out.println(17); }
+        if (1 <= 1) { System.out.println(18); }
+        if (2 <= 1) { } else { System.out.println(19); }
+        if (1 >= 1) { System.out.println(20); }
+        if (1 >= 2) { } else { System.out.println(21); }
+    }
+}
diff --git a/exec/binary_ops.mj.out b/exec/binary_ops.mj.out
new file mode 100644
index 0000000000000000000000000000000000000000..759a7a36476c5d0ee315a9b79dc09c4d11b3e041
--- /dev/null
+++ b/exec/binary_ops.mj.out
@@ -0,0 +1,20 @@
+1
+2
+3
+4
+5
+6
+7
+9
+10
+11
+12
+13
+14
+15
+16
+17
+18
+19
+20
+21
diff --git a/exec/can_call.mj b/exec/can_call.mj
new file mode 100644
index 0000000000000000000000000000000000000000..d2b11f0f8e59d4d440e45ba11fc70858318aa3b0
--- /dev/null
+++ b/exec/can_call.mj
@@ -0,0 +1,11 @@
+class Foo {
+    public int ret_int() {
+        return 48;
+    }
+
+    public static void main(String[] args) {
+        Foo a = new Foo();
+        int b = a.ret_int();
+        System.out.println(b);
+    }
+}
diff --git a/exec/can_call.mj.out b/exec/can_call.mj.out
new file mode 100644
index 0000000000000000000000000000000000000000..21e72e8ac3d7e23bd6532b5f1f4a6bdf8362e6cf
--- /dev/null
+++ b/exec/can_call.mj.out
@@ -0,0 +1 @@
+48
diff --git a/exec/can_short_circuit.mj b/exec/can_short_circuit.mj
new file mode 100644
index 0000000000000000000000000000000000000000..3954359c42b8ff403bd2d266daeb4657869c0510
--- /dev/null
+++ b/exec/can_short_circuit.mj
@@ -0,0 +1,35 @@
+class A {
+    public boolean side_effect() {
+        System.out.write(70); // 
+        System.out.write(10); // newline
+        return false;
+    }
+
+    public static void main(String[] args) {
+        A a = new A();
+        if (true || a.side_effect()) {
+            System.out.write(79); // O
+            System.out.write(75); // K
+            System.out.write(10); // newline
+        }
+
+        if (false && a.side_effect()) {
+        } else {
+            System.out.write(79); // O
+            System.out.write(75); // K
+            System.out.write(10); // newline
+        }
+
+        if (!(false && a.side_effect())) {
+            System.out.write(79); // O
+            System.out.write(75); // K
+            System.out.write(10); // newline
+        }
+
+        if ((true || a.side_effect()) && true) {
+            System.out.write(79); // O
+            System.out.write(75); // K
+            System.out.write(10); // newline
+        }
+    }
+}
diff --git a/exec/can_short_circuit.mj.out b/exec/can_short_circuit.mj.out
new file mode 100644
index 0000000000000000000000000000000000000000..b462a5a7baa4fe959ffeb8c904beeb2f0c97c996
--- /dev/null
+++ b/exec/can_short_circuit.mj.out
@@ -0,0 +1,4 @@
+OK
+OK
+OK
+OK
diff --git a/exec/field_init.mj b/exec/field_init.mj
new file mode 100644
index 0000000000000000000000000000000000000000..1b088a1ae8b9f79536802f08d7866856bdc8af66
--- /dev/null
+++ b/exec/field_init.mj
@@ -0,0 +1,31 @@
+class A {
+    public int a;
+
+    public void print_as() {
+        System.out.println(a);
+        System.out.println(this.a);
+    }
+
+    public static void main(String[] args) {
+        A a = new A();
+        a.print_as();
+        B b = new B();
+
+        if (b.b) {
+            System.out.println(1);
+        } else {
+            System.out.println(0);
+        }
+
+        if (b.c == null) {
+            System.out.println(0);
+        } else {
+            System.out.println(1);
+        }
+    }
+}
+
+class B {
+    public boolean b;
+    public A c;
+}
diff --git a/exec/field_init.mj.out b/exec/field_init.mj.out
new file mode 100644
index 0000000000000000000000000000000000000000..44e0be8e3569542122ae0a5b046af7f8fe713943
--- /dev/null
+++ b/exec/field_init.mj.out
@@ -0,0 +1,4 @@
+0
+0
+0
+0
diff --git a/exec/if_else.mj b/exec/if_else.mj
new file mode 100644
index 0000000000000000000000000000000000000000..62efd85c1d17fee3fc009fba35fc9c5362aec9d3
--- /dev/null
+++ b/exec/if_else.mj
@@ -0,0 +1,15 @@
+class Foo {
+    public static void main(String[] args) {
+        if (true) {
+            System.out.println(1);
+        } else {
+            System.out.println(0);
+        }
+
+        if (false) {
+            System.out.println(0);
+        } else {
+            System.out.println(1);
+        }
+    }
+}
diff --git a/exec/if_else.mj.out b/exec/if_else.mj.out
new file mode 100644
index 0000000000000000000000000000000000000000..6ed281c757a969ffe22f3dcfa5830c532479c726
--- /dev/null
+++ b/exec/if_else.mj.out
@@ -0,0 +1,2 @@
+1
+1
diff --git a/exec/indirect_system_calls.mj b/exec/indirect_system_calls.mj
new file mode 100644
index 0000000000000000000000000000000000000000..a0f74caba63f88c355d70d5dcbca55afc7817f7d
--- /dev/null
+++ b/exec/indirect_system_calls.mj
@@ -0,0 +1,6 @@
+class A {
+
+    public static void main(String[] args) {
+        ((System).out).println(4);
+    }
+}
diff --git a/exec/indirect_system_calls.mj.out b/exec/indirect_system_calls.mj.out
new file mode 100644
index 0000000000000000000000000000000000000000..b8626c4cff2849624fb67f87cd0ad72b163671ad
--- /dev/null
+++ b/exec/indirect_system_calls.mj.out
@@ -0,0 +1 @@
+4
diff --git a/exec/invoke_object_returned_by_expression.mj b/exec/invoke_object_returned_by_expression.mj
new file mode 100644
index 0000000000000000000000000000000000000000..d113020ad2405a4003b6df2cbc76768c8f07c698
--- /dev/null
+++ b/exec/invoke_object_returned_by_expression.mj
@@ -0,0 +1,19 @@
+class A {
+    public B get_object() {
+        return new B();
+    }
+
+    public static void main(String[] args) {
+        A a = new A();
+        int res = (a.get_object()).get_number();
+        System.out.println(res);
+    }
+}
+
+class B {
+
+    public int get_number() {
+        return 99;
+    }
+
+}
diff --git a/exec/invoke_object_returned_by_expression.mj.out b/exec/invoke_object_returned_by_expression.mj.out
new file mode 100644
index 0000000000000000000000000000000000000000..3ad5abd03aea89f7de126c4861363e4f64355973
--- /dev/null
+++ b/exec/invoke_object_returned_by_expression.mj.out
@@ -0,0 +1 @@
+99
diff --git a/exec/multiassign.mj b/exec/multiassign.mj
new file mode 100644
index 0000000000000000000000000000000000000000..05d333ed3208f10e9fdf1ca8d0b068be609e996f
--- /dev/null
+++ b/exec/multiassign.mj
@@ -0,0 +1,9 @@
+eass A {
+
+    public static void main(String[] args) {
+        int x = 8;
+        int y = x = 4;
+        System.out.println(x);
+        System.out.println(y);
+    }
+}
diff --git a/exec/multiassign.mj.out b/exec/multiassign.mj.out
new file mode 100644
index 0000000000000000000000000000000000000000..7290ba859f4adbf90d68526fe0ab1f8cbcf65098
--- /dev/null
+++ b/exec/multiassign.mj.out
@@ -0,0 +1,2 @@
+4
+4
diff --git a/exec/return.mj b/exec/return.mj
new file mode 100644
index 0000000000000000000000000000000000000000..0e5df5e7bd20282047b82547d8dc90488af18cf0
--- /dev/null
+++ b/exec/return.mj
@@ -0,0 +1,12 @@
+class A {
+
+    public int loopy_1() {
+        int i = 3;
+        while (i < 5) { return i; }
+    }
+
+    public static void main(String[] args) {
+        System.out.println((new A()).loopy_1());
+    }
+}
+
diff --git a/exec/return.mj.out b/exec/return.mj.out
new file mode 100644
index 0000000000000000000000000000000000000000..00750edc07d6415dcc07ae0351e9397b0222b7ba
--- /dev/null
+++ b/exec/return.mj.out
@@ -0,0 +1 @@
+3
diff --git a/exec/unary_ops.mj b/exec/unary_ops.mj
new file mode 100644
index 0000000000000000000000000000000000000000..934bc55dbbfc3489c0ddb257548e5b7731da775a
--- /dev/null
+++ b/exec/unary_ops.mj
@@ -0,0 +1,10 @@
+class A {
+    public static void main(String[] args) {
+        int x = 4;
+        System.out.println(-x);
+
+        if (!false) { System.out.println(-3); }
+        if (!true) { } else { System.out.println(-2); }
+        if (!!!true) { } else { System.out.println(-1); }
+    }
+}
diff --git a/exec/unary_ops.mj.out b/exec/unary_ops.mj.out
new file mode 100644
index 0000000000000000000000000000000000000000..cc86190095aa23b86c2c6c6d4295f66fec0cec32
--- /dev/null
+++ b/exec/unary_ops.mj.out
@@ -0,0 +1,4 @@
+-4
+-3
+-2
+-1
diff --git a/exec/while.mj b/exec/while.mj
new file mode 100644
index 0000000000000000000000000000000000000000..2b966fb2a41ca03fe838e663a4c5e5eb8b5eebf8
--- /dev/null
+++ b/exec/while.mj
@@ -0,0 +1,13 @@
+class A {
+
+    public static void main(String[] args) {
+        int x = 0;
+        boolean a = false;
+        while(a) { x = 1; }
+        System.out.println(x);
+
+        while(x < 5) { x = x + 1; }
+        System.out.println(x);
+    }
+}
+
diff --git a/exec/while.mj.out b/exec/while.mj.out
new file mode 100644
index 0000000000000000000000000000000000000000..fd3306644d5e1b02d04173108535270ac9a218b5
--- /dev/null
+++ b/exec/while.mj.out
@@ -0,0 +1,2 @@
+0
+5