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Diffstat (limited to 'README.md')
| -rw-r--r-- | README.md | 60 |
1 files changed, 57 insertions, 3 deletions
@@ -128,6 +128,60 @@ int multiply10to20() { Methods generating methods! And since JavaPoet generates source instead of bytecode, you can read through it to make sure it's right. +Some control flow statements, such as `if/else`, can have unlimited control flow possibilities. +You can handle those options using `nextControlFlow()`: + +```java +MethodSpec main = MethodSpec.methodBuilder("main") + .addStatement("long now = $T.currentTimeMillis()", System.class) + .beginControlFlow("if ($T.currentTimeMillis() < now)", System.class) + .addStatement("$T.out.println($S)", System.class, "Time travelling, woo hoo!") + .nextControlFlow("else if ($T.currentTimeMillis() == now)", System.class) + .addStatement("$T.out.println($S)", System.class, "Time stood still!") + .nextControlFlow("else") + .addStatement("$T.out.println($S)", System.class, "Ok, time still moving forward") + .endControlFlow() + .build(); +``` + +Which generates: + +```java +void main() { + long now = System.currentTimeMillis(); + if (System.currentTimeMillis() < now) { + System.out.println("Time travelling, woo hoo!"); + } else if (System.currentTimeMillis() == now) { + System.out.println("Time stood still!"); + } else { + System.out.println("Ok, time still moving forward"); + } +} +``` + +Catching exceptions using `try/catch` is also a use case for `nextControlFlow()`: + +```java +MethodSpec main = MethodSpec.methodBuilder("main") + .beginControlFlow("try") + .addStatement("throw new Exception($S)", "Failed") + .nextControlFlow("catch ($T e)", Exception.class) + .addStatement("throw new $T(e)", RuntimeException.class) + .endControlFlow() + .build(); +``` + +Which produces: + +```java +void main() { + try { + throw new Exception("Failed"); + } catch (Exception e) { + throw new RuntimeException(e); + } +} +``` ### $L for Literals @@ -674,7 +728,7 @@ public enum Roshambo { ### Anonymous Inner Classes -In the enum code, we used `Types.anonymousInnerClass()`. Anonymous inner classes can also be used in +In the enum code, we used `TypeSpec.anonymousInnerClass()`. Anonymous inner classes can also be used in code blocks. They are values that can be referenced with `$L`: ```java @@ -838,12 +892,12 @@ Download [the latest .jar][dl] or depend via Maven: <dependency> <groupId>com.squareup</groupId> <artifactId>javapoet</artifactId> - <version>1.11.1</version> + <version>1.12.0</version> </dependency> ``` or Gradle: ```groovy -compile 'com.squareup:javapoet:1.11.1' +compile 'com.squareup:javapoet:1.12.0' ``` Snapshots of the development version are available in [Sonatype's `snapshots` repository][snap]. |