Fix #852 : API for creating a CodeBlock Statement directly

src/main/java/com/squareup/javapoet/CodeBlock.java

@@ -105,6 +105,9 @@ public static CodeBlock of(String format, Object... args) {
     return new Builder().add(format, args).build();
   }
 
+  public static CodeBlock ofStatement(String format, Object... args){
+    return CodeBlock.builder().addStatement(format, args).build();
+  }
   /**
    * Joins {@code codeBlocks} into a single {@link CodeBlock}, each separated by {@code separator}.
    * For example, joining {@code String s}, {@code Object o} and {@code int i} using {@code ", "}

src/test/java/com/squareup/javapoet/CodeBlockTest.java

@@ -19,6 +19,7 @@
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
+
 import org.junit.Test;
 
 import static com.google.common.truth.Truth.assertThat;
@@ -43,6 +44,15 @@ public final class CodeBlockTest {
     assertThat(a.toString()).isEqualTo("delicious taco");
   }
 
+  @Test public void ofStatement() {
+    CodeBlock a = CodeBlock.ofStatement("$L taco", "delicious");
+    assertThat(a.toString()).isEqualTo("delicious taco;\n");
+  }
+
+  @Test public void ofStatement2() {
+    assertThat(CodeBlock.ofStatement("println($L)", "\"hello world\"").toString()).isEqualTo("println(\"hello world\");\n");
+  }
+
   @Test public void isEmpty() {
     assertTrue(CodeBlock.builder().isEmpty());
     assertTrue(CodeBlock.builder().add("").isEmpty());