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@JakeWharton
JakeWharton / Java6.java
Last active May 28, 2022 16:14
A comparison between non-capturing and capturing expressions across Java 6, Java 8, Java 8 with Retrolambda, Kotlin with native function expressions, and Kotlin with Java SAM expression.
import java.util.Arrays;
class NonCapturing {
public static void main(String... args) {
run(new Runnable() {
@Override public void run() {
System.out.println("Hey!");
}
});
}
@JakeWharton
JakeWharton / visibilities.sh
Last active May 24, 2019 00:03
A bash script to count the visibility modifiers in a jar file.
#!/bin/bash
if [ $# != 1 ]; then
echo "Pass jar as sole argument"
exit 1
fi
tmp=`mktemp -d`
unzip -d "$tmp" $1 1> /dev/null
@JakeWharton
JakeWharton / GenericCovariants.java
Created January 7, 2016 06:32
Unlike synthetic accessor methods, these synthetic covariant methods are hard or impossible to kill. Generics anyone?
interface Thing<T> {
T thing();
}
class CharSequenceThing implements Thing<CharSequence> {
@Override public CharSequence thing() {
return "CharSequence!";
}
}
@JakeWharton
JakeWharton / CovariantReturnTypes.java
Created January 7, 2016 05:59
Covariant return types generate an extra method in bytecode. This compounds in each subclass further specializing the type.
interface Thing {
Object thing();
}
class CharSequenceThing implements Thing {
@Override public CharSequence thing() {
return "CharSequence!";
}
}
@JakeWharton
JakeWharton / Oauth1SigningInterceptor.java
Last active November 27, 2023 10:04
An OkHttp interceptor which does OAuth1 signing. Requires Guava and Java 8, although those dependencies wouldn't be too hard to break if you didn't have them.
/*
* Copyright (C) 2015 Jake Wharton
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
@JakeWharton
JakeWharton / ShampooRule.java
Last active August 31, 2023 15:47
Got flaky tests? Shampoo them away with a quick JUnit rule. Apache 2.
import org.junit.rules.TestRule;
import org.junit.runner.Description;
import org.junit.runners.model.Statement;
/** Got flaky tests? Shampoo them away. */
public final class ShampooRule implements TestRule {
private final int iterations;
public ShampooRule(int iterations) {
if (iterations < 1) throw new IllegalArgumentException("iterations < 1: " + iterations);
@JakeWharton
JakeWharton / build.gradle
Created March 29, 2015 06:34
A Gradle task for installing all application variants at once. Placed in the public domain.
def installAll = tasks.create('installAll')
installAll.description = 'Install all applications.'
android.applicationVariants.all { variant ->
installAll.dependsOn(variant.install)
// Ensure we end up in the same group as the other install tasks.
installAll.group = variant.install.group
}
@JakeWharton
JakeWharton / UiThreadRule.java
Last active January 12, 2024 17:43
A JUnit @rule which runs individual tests on the Android UI thread. http://b.android.com/157356
/*
* Copyright (C) 2015 Jake Wharton
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
@JakeWharton
JakeWharton / gist:f50f3b4d87e57d8e96e9
Created February 7, 2015 01:59
Rise and Shine™, unlock and wake up your device automatically when you deploy from the IDE. Put this somewhere in your `src/debug/` code and run it when the application or main activity starts. Apache 2.
/**
* Show the activity over the lockscreen and wake up the device. If you launched the app manually
* both of these conditions are already true. If you deployed from the IDE, however, this will
* save you from hundreds of power button presses and pattern swiping per day!
*/
public static void riseAndShine(Activity activity) {
activity.getWindow().addFlags(FLAG_SHOW_WHEN_LOCKED);
PowerManager power = (PowerManager) activity.getSystemService(POWER_SERVICE);
PowerManager.WakeLock lock =
@JakeWharton
JakeWharton / README.md
Last active April 17, 2023 14:07
A JUnit @rule which launches an activity when your test starts. Stop extending gross ActivityInstrumentationBarfCase2!