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Is there any difference between empty block and Unit

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0

Is there any difference between empty block and returning Unit?

for example, we should make empty block to method do nothing

void ThisMethodDoesNothing() 

In kotlin, we can write code above but this way

fun ThisMethodDoesNothing() = Unit

Please let me know if this is duplicated, thanks.

kotlin

share|improve this question

asked Mar 28 at 3:25

SlaneRSlaneR

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0

Is there any difference between empty block and returning Unit?

for example, we should make empty block to method do nothing

void ThisMethodDoesNothing() 

In kotlin, we can write code above but this way

fun ThisMethodDoesNothing() = Unit

Please let me know if this is duplicated, thanks.

kotlin

share|improve this question

asked Mar 28 at 3:25

SlaneRSlaneR

43933 silver badges1313 bronze badges

add a comment | 

Is there any difference between empty block and returning Unit?

for example, we should make empty block to method do nothing

void ThisMethodDoesNothing() 

In kotlin, we can write code above but this way

fun ThisMethodDoesNothing() = Unit

Please let me know if this is duplicated, thanks.

kotlin

share|improve this question

asked Mar 28 at 3:25

SlaneRSlaneR

43933 silver badges1313 bronze badges

void ThisMethodDoesNothing() 

fun ThisMethodDoesNothing() = Unit

share|improve this question

asked Mar 28 at 3:25

SlaneRSlaneR

43933 silver badges1313 bronze badges

share|improve this question

asked Mar 28 at 3:25

SlaneRSlaneR

43933 silver badges1313 bronze badges

asked Mar 28 at 3:25

SlaneRSlaneR

43933 silver badges1313 bronze badges

asked Mar 28 at 3:25

SlaneRSlaneR

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1 Answer
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3

I figured that the two probably did the same thing, but I had no way to be sure. I really wanted to know. So I created a class to put each of these in (since Java must have a class around any code), changed the Kotlin version so that the attributes on the method were the same, and that gave me this:

a.java

public class a 
 public final void ThisMethodDoesNothing() 

b.kt

class b 
 fun ThisMethodDoesNothing() = Unit

Then I compiled each of these, and then decompiled them with javad -c, and got:

> javap -c com.inlet.ifserver.a
Compiled from "a.java"
public class com.inlet.ifserver.a 
 public com.inlet.ifserver.a();
 Code:
 0: aload_0
 1: invokespecial #1 // Method java/lang/Object."<init>":()V
 4: return

 public final void ThisMethodDoesNothing();
 Code:
 0: return


> javap -c com.inlet.ifserver.b
Compiled from "b.kt"
public final class com.inlet.ifserver.b 
 public final void ThisMethodDoesNothing();
 Code:
 0: return

 public com.inlet.ifserver.b();
 Code:
 0: aload_0
 1: invokespecial #11 // Method java/lang/Object."<init>":()V
 4: return

So I think the answer is a resounding YES! Both do absolutely nothing.

share|improve this answer

answered Mar 28 at 4:10

SteveSteve

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add a comment | 

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3

I figured that the two probably did the same thing, but I had no way to be sure. I really wanted to know. So I created a class to put each of these in (since Java must have a class around any code), changed the Kotlin version so that the attributes on the method were the same, and that gave me this:

a.java

public class a 
 public final void ThisMethodDoesNothing() 

b.kt

class b 
 fun ThisMethodDoesNothing() = Unit

Then I compiled each of these, and then decompiled them with javad -c, and got:

> javap -c com.inlet.ifserver.a
Compiled from "a.java"
public class com.inlet.ifserver.a 
 public com.inlet.ifserver.a();
 Code:
 0: aload_0
 1: invokespecial #1 // Method java/lang/Object."<init>":()V
 4: return

 public final void ThisMethodDoesNothing();
 Code:
 0: return


> javap -c com.inlet.ifserver.b
Compiled from "b.kt"
public final class com.inlet.ifserver.b 
 public final void ThisMethodDoesNothing();
 Code:
 0: return

 public com.inlet.ifserver.b();
 Code:
 0: aload_0
 1: invokespecial #11 // Method java/lang/Object."<init>":()V
 4: return

So I think the answer is a resounding YES! Both do absolutely nothing.

share|improve this answer

answered Mar 28 at 4:10

SteveSteve

4,81011 gold badge88 silver badges3131 bronze badges

add a comment | 

3

I figured that the two probably did the same thing, but I had no way to be sure. I really wanted to know. So I created a class to put each of these in (since Java must have a class around any code), changed the Kotlin version so that the attributes on the method were the same, and that gave me this:

a.java

public class a 
 public final void ThisMethodDoesNothing() 

b.kt

class b 
 fun ThisMethodDoesNothing() = Unit

Then I compiled each of these, and then decompiled them with javad -c, and got:

> javap -c com.inlet.ifserver.a
Compiled from "a.java"
public class com.inlet.ifserver.a 
 public com.inlet.ifserver.a();
 Code:
 0: aload_0
 1: invokespecial #1 // Method java/lang/Object."<init>":()V
 4: return

 public final void ThisMethodDoesNothing();
 Code:
 0: return


> javap -c com.inlet.ifserver.b
Compiled from "b.kt"
public final class com.inlet.ifserver.b 
 public final void ThisMethodDoesNothing();
 Code:
 0: return

 public com.inlet.ifserver.b();
 Code:
 0: aload_0
 1: invokespecial #11 // Method java/lang/Object."<init>":()V
 4: return

So I think the answer is a resounding YES! Both do absolutely nothing.

share|improve this answer

answered Mar 28 at 4:10

SteveSteve

4,81011 gold badge88 silver badges3131 bronze badges

add a comment | 

I figured that the two probably did the same thing, but I had no way to be sure. I really wanted to know. So I created a class to put each of these in (since Java must have a class around any code), changed the Kotlin version so that the attributes on the method were the same, and that gave me this:

a.java

public class a 
 public final void ThisMethodDoesNothing() 

b.kt

class b 
 fun ThisMethodDoesNothing() = Unit

Then I compiled each of these, and then decompiled them with javad -c, and got:

> javap -c com.inlet.ifserver.a
Compiled from "a.java"
public class com.inlet.ifserver.a 
 public com.inlet.ifserver.a();
 Code:
 0: aload_0
 1: invokespecial #1 // Method java/lang/Object."<init>":()V
 4: return

 public final void ThisMethodDoesNothing();
 Code:
 0: return


> javap -c com.inlet.ifserver.b
Compiled from "b.kt"
public final class com.inlet.ifserver.b 
 public final void ThisMethodDoesNothing();
 Code:
 0: return

 public com.inlet.ifserver.b();
 Code:
 0: aload_0
 1: invokespecial #11 // Method java/lang/Object."<init>":()V
 4: return

So I think the answer is a resounding YES! Both do absolutely nothing.

share|improve this answer

answered Mar 28 at 4:10

SteveSteve

4,81011 gold badge88 silver badges3131 bronze badges

public class a 
 public final void ThisMethodDoesNothing() 

class b 
 fun ThisMethodDoesNothing() = Unit

> javap -c com.inlet.ifserver.a
Compiled from "a.java"
public class com.inlet.ifserver.a 
 public com.inlet.ifserver.a();
 Code:
 0: aload_0
 1: invokespecial #1 // Method java/lang/Object."<init>":()V
 4: return

 public final void ThisMethodDoesNothing();
 Code:
 0: return


> javap -c com.inlet.ifserver.b
Compiled from "b.kt"
public final class com.inlet.ifserver.b 
 public final void ThisMethodDoesNothing();
 Code:
 0: return

 public com.inlet.ifserver.b();
 Code:
 0: aload_0
 1: invokespecial #11 // Method java/lang/Object."<init>":()V
 4: return

share|improve this answer

answered Mar 28 at 4:10

SteveSteve

4,81011 gold badge88 silver badges3131 bronze badges

answered Mar 28 at 4:10

SteveSteve

4,81011 gold badge88 silver badges3131 bronze badges

answered Mar 28 at 4:10

SteveSteve

4,81011 gold badge88 silver badges3131 bronze badges