用lambda表达式创建匿名对象[重复]

Question

我试图用Lamdas简化我的对象创建。

ScriptCommand cmd = new ScriptCommand() {
                    @Override
                    public void run(double deltaTime) {
                      // some logic here...
                    }
                };
addCmd(cmd);

ScriptCommand cmd = (deltaTime) -> {
                    // some logic here...
                };
addCmd(cmd);

ScriptCommand如下所示：

public abstract class ScriptCommand {
    private boolean completed = false;

    public abstract void run(double deltaTime);

    protected void complete() {
        completed = true;
    }

    public boolean isCompleted() {
        return completed;
    }

}

Answer 1

示例：

@FunctionalInterface // Optional
interface ScriptCommand {
  void run(double deltaTime);
}

public static void main(String[] args) {
  ScriptCommand command = (deltaTime) -> System.out.println(deltaTime);
  // execute code
  command.run(3);
  // if you want to call addCmd(ScriptCommand)
  addCmd(command);
  addCmd((deltaTime) -> System.out.println(deltaTime));
}

产出：3.0