从Java到Kotlin——方法

Java

public void hello(){ System.out.print("Hello, World!"); } 

Java

public void hello(String name){ System.out.print("Hello, " + name + "!"); } 

Java

public void hello(String name){ if (name == null) { name = "World"; } System.out.print("Hello, " + name + "!"); } 

Java

public boolean hasItems(){ return true; } 

Java

public double cube(double x){ return x * x * x; } 

Java

public int sum(int... numbers){ } 

Java

public class MyClass{ public static void main(String[] args){ } } 

Java

public static void main(String[]args){ openFile("file.txt", true); } public static File openFile(String filename,boolean readOnly){ } 

Java

public static void main(String[]args){ createFile("file.txt"); createFile("file.txt", true); createFile("file.txt", true, false); createExecutableFile("file.txt"); } public static File createFile(String filename){ } public static File createFile(String filename,boolean appendDate){ } public static File createFile(String filename,boolean appendDate, boolean executable){ } public static File createExecutableFile(String filename){ } 

Java

public void init(){ List<String> moduleInferred = createList("net"); } public <T> List<T>createList(T item){ }