java.lang.Object
- org.apache.bcel.generic.InstructionConst

```
public final class InstructionConst
extends java.lang.Object
```
Contains shareable instruction objects.
In order to save memory you can use some instructions multiply, since they have an immutable state and are directly derived from Instruction. I.e. they have no instance fields that could be changed. Since some of these instructions like ICONST_0 occur very frequently this can save a lot of time and space. This feature is an adaptation of the FlyWeight design pattern, we just use an array instead of a factory.

The Instructions can also accessed directly under their names, so it's possible to write il.append(Instruction.ICONST_0);

Field Summary

Fields
Modifier and Type	Field	Description
`static ArrayInstruction`	`AALOAD`	AALOAD instruction.
`static ArrayInstruction`	`AASTORE`	AASTORE instruction.
`static Instruction`	`ACONST_NULL`	ACONST_NULL instruction.
`static LocalVariableInstruction`	`ALOAD_0`	ALOAD_0 instruction (same as THIS).
`static LocalVariableInstruction`	`ALOAD_1`	ALOAD_1 instruction.
`static LocalVariableInstruction`	`ALOAD_2`	ALOAD_2 instruction.
`static ReturnInstruction`	`ARETURN`	ARETURN instruction.
`static Instruction`	`ARRAYLENGTH`	ARRAYLENGTH instruction.
`static LocalVariableInstruction`	`ASTORE_0`	ASTORE_0 instruction.
`static LocalVariableInstruction`	`ASTORE_1`	ASTORE_1 instruction.
`static LocalVariableInstruction`	`ASTORE_2`	ASTORE_2 instruction.
`static Instruction`	`ATHROW`	ATHROW instruction.
`static ArrayInstruction`	`BALOAD`	BALOAD instruction.
`static ArrayInstruction`	`BASTORE`	BASTORE instruction.
`static ArrayInstruction`	`CALOAD`	CALOAD instruction.
`static ArrayInstruction`	`CASTORE`	CASTORE instruction.
`static ConversionInstruction`	`D2F`	D2F instruction.
`static ConversionInstruction`	`D2I`	D2I instruction.
`static ConversionInstruction`	`D2L`	D2L instruction.
`static ArithmeticInstruction`	`DADD`	DADD instruction.
`static ArrayInstruction`	`DALOAD`	DALOAD instruction.
`static ArrayInstruction`	`DASTORE`	DASTORE instruction.
`static Instruction`	`DCMPG`	DCMPG instruction.
`static Instruction`	`DCMPL`	DCMPL instruction.
`static Instruction`	`DCONST_0`	DCONST_0 instruction.
`static Instruction`	`DCONST_1`	DCONST_1 instruction.
`static ArithmeticInstruction`	`DDIV`	DDIV instruction.
`static ArithmeticInstruction`	`DMUL`	DMUL instruction.
`static ArithmeticInstruction`	`DNEG`	DNEG instruction.
`static ArithmeticInstruction`	`DREM`	DREM instruction.
`static ReturnInstruction`	`DRETURN`	DRETURN instruction.
`static ArithmeticInstruction`	`DSUB`	DSUB instruction.
`static StackInstruction`	`DUP`	DUP instruction.
`static StackInstruction`	`DUP_X1`	DUP_X1 instruction.
`static StackInstruction`	`DUP_X2`	DUP_X2 instruction.
`static StackInstruction`	`DUP2`	DUP2 instruction.
`static StackInstruction`	`DUP2_X1`	DUP2_X1 instruction.
`static StackInstruction`	`DUP2_X2`	DUP2_X2 instruction.
`static ConversionInstruction`	`F2D`	F2D instruction.
`static ConversionInstruction`	`F2I`	F2I instruction.
`static ConversionInstruction`	`F2L`	F2L instruction.
`static ArithmeticInstruction`	`FADD`	FADD instruction.
`static ArrayInstruction`	`FALOAD`	FALOAD instruction.
`static ArrayInstruction`	`FASTORE`	FASTORE instruction.
`static Instruction`	`FCMPG`	FCMPG instruction.
`static Instruction`	`FCMPL`	FCMPL instruction.
`static Instruction`	`FCONST_0`	FCONST_0 instruction.
`static Instruction`	`FCONST_1`	FCONST_1 instruction.
`static Instruction`	`FCONST_2`	FCONST_2 instruction.
`static ArithmeticInstruction`	`FDIV`	FDIV instruction.
`static ArithmeticInstruction`	`FMUL`	FMUL instruction.
`static ArithmeticInstruction`	`FNEG`	FNEG instruction.
`static ArithmeticInstruction`	`FREM`	FREM instruction.
`static ReturnInstruction`	`FRETURN`	FRETURN instruction.
`static ArithmeticInstruction`	`FSUB`	FSUB instruction.
`static ConversionInstruction`	`I2B`	I2B instruction.
`static ConversionInstruction`	`I2C`	I2C instruction.
`static ConversionInstruction`	`I2D`	I2D instruction.
`static ConversionInstruction`	`I2F`	I2F instruction.
`static ConversionInstruction`	`I2L`	I2L instruction.
`static ConversionInstruction`	`I2S`	I2S instruction.
`static ArithmeticInstruction`	`IADD`	IADD instruction.
`static ArrayInstruction`	`IALOAD`	IALOAD instruction.
`static ArithmeticInstruction`	`IAND`	IAND instruction.
`static ArrayInstruction`	`IASTORE`	IASTORE instruction.
`static Instruction`	`ICONST_0`	ICONST_0 instruction.
`static Instruction`	`ICONST_1`	ICONST_1 instruction.
`static Instruction`	`ICONST_2`	ICONST_2 instruction.
`static Instruction`	`ICONST_3`	ICONST_3 instruction.
`static Instruction`	`ICONST_4`	ICONST_4 instruction.
`static Instruction`	`ICONST_5`	ICONST_5 instruction.
`static Instruction`	`ICONST_M1`	ICONST_M1 instruction.
`static ArithmeticInstruction`	`IDIV`	IDIV instruction.
`static LocalVariableInstruction`	`ILOAD_0`	ILOAD_0 instruction.
`static LocalVariableInstruction`	`ILOAD_1`	ILOAD_1 instruction.
`static LocalVariableInstruction`	`ILOAD_2`	ILOAD_2 instruction.
`static ArithmeticInstruction`	`IMUL`	IMUL instruction.
`static ArithmeticInstruction`	`INEG`	INEG instruction.
`(package private) static Instruction[]`	`INSTRUCTIONS`	Gets object via its opcode, for immutable instructions like branch instructions entries are set to null.
`static ArithmeticInstruction`	`IOR`	IOR instruction.
`static ArithmeticInstruction`	`IREM`	IREM instruction.
`static ReturnInstruction`	`IRETURN`	IRETURN instruction.
`static ArithmeticInstruction`	`ISHL`	ISHL instruction.
`static ArithmeticInstruction`	`ISHR`	ISHR instruction.
`static LocalVariableInstruction`	`ISTORE_0`	ISTORE_0 instruction.
`static LocalVariableInstruction`	`ISTORE_1`	ISTORE_1 instruction.
`static LocalVariableInstruction`	`ISTORE_2`	ISTORE_2 instruction.
`static ArithmeticInstruction`	`ISUB`	ISUB instruction.
`static ArithmeticInstruction`	`IUSHR`	IUSHR instruction.
`static ArithmeticInstruction`	`IXOR`	IXOR instruction.
`static ConversionInstruction`	`L2D`	L2D instruction.
`static ConversionInstruction`	`L2F`	L2F instruction.
`static ConversionInstruction`	`L2I`	L2I instruction.
`static ArithmeticInstruction`	`LADD`	LADD instruction.
`static ArrayInstruction`	`LALOAD`	LALOAD instruction.
`static ArithmeticInstruction`	`LAND`	LAND instruction.
`static ArrayInstruction`	`LASTORE`	LASTORE instruction.
`static Instruction`	`LCMP`	LCMP instruction.
`static Instruction`	`LCONST_0`	LCONST_0 instruction.
`static Instruction`	`LCONST_1`	LCONST_1 instruction.
`static ArithmeticInstruction`	`LDIV`	LDIV instruction.
`static ArithmeticInstruction`	`LMUL`	LMUL instruction.
`static ArithmeticInstruction`	`LNEG`	LNEG instruction.
`static ArithmeticInstruction`	`LOR`	LOR instruction.
`static ArithmeticInstruction`	`LREM`	LREM instruction.
`static ReturnInstruction`	`LRETURN`	LRETURN instruction.
`static ArithmeticInstruction`	`LSHL`	LSHL instruction.
`static ArithmeticInstruction`	`LSHR`	LSHR instruction.
`static ArithmeticInstruction`	`LSUB`	LSUB instruction.
`static ArithmeticInstruction`	`LUSHR`	LUSHR instruction.
`static ArithmeticInstruction`	`LXOR`	LXOR instruction.
`static Instruction`	`MONITORENTER`	MONITORENTER instruction.
`static Instruction`	`MONITOREXIT`	MONITOREXIT instruction.
`static Instruction`	`NOP`	NOP instruction.
`static StackInstruction`	`POP`	POP instruction.
`static StackInstruction`	`POP2`	POP2 instruction.
`static ReturnInstruction`	`RETURN`	RETURN instruction.
`static ArrayInstruction`	`SALOAD`	SALOAD instruction.
`static ArrayInstruction`	`SASTORE`	SASTORE instruction.
`static StackInstruction`	`SWAP`	SWAP instruction.
`static LocalVariableInstruction`	`THIS`	You can use these constants in multiple places safely, if you can guarantee that you will never alter their internal values, for example call setIndex().

Constructor Summary

Constructors
Modifier Constructor Description

private InstructionConst()

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type Method Description

static Instruction getInstruction(int index)
Gets the Instruction.
- Methods inherited from class java.lang.Object
  clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

NOP
```
public static final Instruction NOP
```
NOP instruction.

ACONST_NULL

public static final Instruction ACONST_NULL

ACONST_NULL instruction.

ICONST_M1

public static final Instruction ICONST_M1

ICONST_M1 instruction.

ICONST_0

public static final Instruction ICONST_0

ICONST_0 instruction.

ICONST_1

public static final Instruction ICONST_1

ICONST_1 instruction.

ICONST_2

public static final Instruction ICONST_2

ICONST_2 instruction.

ICONST_3

public static final Instruction ICONST_3

ICONST_3 instruction.

ICONST_4

public static final Instruction ICONST_4

ICONST_4 instruction.

ICONST_5

public static final Instruction ICONST_5

ICONST_5 instruction.

LCONST_0

public static final Instruction LCONST_0

LCONST_0 instruction.

LCONST_1

public static final Instruction LCONST_1

LCONST_1 instruction.

FCONST_0

public static final Instruction FCONST_0

FCONST_0 instruction.

FCONST_1

public static final Instruction FCONST_1

FCONST_1 instruction.

FCONST_2

public static final Instruction FCONST_2

FCONST_2 instruction.

DCONST_0

public static final Instruction DCONST_0

DCONST_0 instruction.

DCONST_1

public static final Instruction DCONST_1

DCONST_1 instruction.

IALOAD

public static final ArrayInstruction IALOAD

IALOAD instruction.

LALOAD

public static final ArrayInstruction LALOAD

LALOAD instruction.

FALOAD

public static final ArrayInstruction FALOAD

FALOAD instruction.

DALOAD

public static final ArrayInstruction DALOAD

DALOAD instruction.

AALOAD

public static final ArrayInstruction AALOAD

AALOAD instruction.

BALOAD

public static final ArrayInstruction BALOAD

BALOAD instruction.

CALOAD

public static final ArrayInstruction CALOAD

CALOAD instruction.

SALOAD

public static final ArrayInstruction SALOAD

SALOAD instruction.

IASTORE

public static final ArrayInstruction IASTORE

IASTORE instruction.

LASTORE

public static final ArrayInstruction LASTORE

LASTORE instruction.

FASTORE

public static final ArrayInstruction FASTORE

FASTORE instruction.

DASTORE

public static final ArrayInstruction DASTORE

DASTORE instruction.

AASTORE

public static final ArrayInstruction AASTORE

AASTORE instruction.

BASTORE

public static final ArrayInstruction BASTORE

BASTORE instruction.

CASTORE

public static final ArrayInstruction CASTORE

CASTORE instruction.

SASTORE

public static final ArrayInstruction SASTORE

SASTORE instruction.

POP

public static final StackInstruction POP

POP instruction.

POP2

public static final StackInstruction POP2

POP2 instruction.

DUP

public static final StackInstruction DUP

DUP instruction.

DUP_X1

public static final StackInstruction DUP_X1

DUP_X1 instruction.

DUP_X2

public static final StackInstruction DUP_X2

DUP_X2 instruction.

DUP2

public static final StackInstruction DUP2

DUP2 instruction.

DUP2_X1

public static final StackInstruction DUP2_X1

DUP2_X1 instruction.

DUP2_X2

public static final StackInstruction DUP2_X2

DUP2_X2 instruction.

SWAP

public static final StackInstruction SWAP

SWAP instruction.

IADD

public static final ArithmeticInstruction IADD

IADD instruction.

LADD

public static final ArithmeticInstruction LADD

LADD instruction.

FADD

public static final ArithmeticInstruction FADD

FADD instruction.

DADD

public static final ArithmeticInstruction DADD

DADD instruction.

ISUB

public static final ArithmeticInstruction ISUB

ISUB instruction.

LSUB

public static final ArithmeticInstruction LSUB

LSUB instruction.

FSUB

public static final ArithmeticInstruction FSUB

FSUB instruction.

DSUB

public static final ArithmeticInstruction DSUB

DSUB instruction.

IMUL

public static final ArithmeticInstruction IMUL

IMUL instruction.

LMUL

public static final ArithmeticInstruction LMUL

LMUL instruction.

FMUL

public static final ArithmeticInstruction FMUL

FMUL instruction.

DMUL

public static final ArithmeticInstruction DMUL

DMUL instruction.

IDIV

public static final ArithmeticInstruction IDIV

IDIV instruction.

LDIV

public static final ArithmeticInstruction LDIV

LDIV instruction.

FDIV

public static final ArithmeticInstruction FDIV

FDIV instruction.

DDIV

public static final ArithmeticInstruction DDIV

DDIV instruction.

IREM

public static final ArithmeticInstruction IREM

IREM instruction.

LREM

public static final ArithmeticInstruction LREM

LREM instruction.

FREM

public static final ArithmeticInstruction FREM

FREM instruction.

DREM

public static final ArithmeticInstruction DREM

DREM instruction.

INEG

public static final ArithmeticInstruction INEG

INEG instruction.

LNEG

public static final ArithmeticInstruction LNEG

LNEG instruction.

FNEG

public static final ArithmeticInstruction FNEG

FNEG instruction.

DNEG

public static final ArithmeticInstruction DNEG

DNEG instruction.

ISHL

public static final ArithmeticInstruction ISHL

ISHL instruction.

LSHL

public static final ArithmeticInstruction LSHL

LSHL instruction.

ISHR

public static final ArithmeticInstruction ISHR

ISHR instruction.

LSHR

public static final ArithmeticInstruction LSHR

LSHR instruction.

IUSHR

public static final ArithmeticInstruction IUSHR

IUSHR instruction.

LUSHR

public static final ArithmeticInstruction LUSHR

LUSHR instruction.

IAND

public static final ArithmeticInstruction IAND

IAND instruction.

LAND

public static final ArithmeticInstruction LAND

LAND instruction.

IOR

public static final ArithmeticInstruction IOR

IOR instruction.

LOR

public static final ArithmeticInstruction LOR

LOR instruction.

IXOR

public static final ArithmeticInstruction IXOR

IXOR instruction.

LXOR

public static final ArithmeticInstruction LXOR

LXOR instruction.

I2L

public static final ConversionInstruction I2L

I2L instruction.

I2F

public static final ConversionInstruction I2F

I2F instruction.

I2D

public static final ConversionInstruction I2D

I2D instruction.

L2I

public static final ConversionInstruction L2I

L2I instruction.

L2F

public static final ConversionInstruction L2F

L2F instruction.

L2D

public static final ConversionInstruction L2D

L2D instruction.

F2I

public static final ConversionInstruction F2I

F2I instruction.

F2L

public static final ConversionInstruction F2L

F2L instruction.

F2D

public static final ConversionInstruction F2D

F2D instruction.

D2I

public static final ConversionInstruction D2I

D2I instruction.

D2L

public static final ConversionInstruction D2L

D2L instruction.

D2F

public static final ConversionInstruction D2F

D2F instruction.

I2B

public static final ConversionInstruction I2B

I2B instruction.

I2C

public static final ConversionInstruction I2C

I2C instruction.

I2S

public static final ConversionInstruction I2S

I2S instruction.

LCMP
```
public static final Instruction LCMP
```
LCMP instruction.

FCMPL
```
public static final Instruction FCMPL
```
FCMPL instruction.

FCMPG
```
public static final Instruction FCMPG
```
FCMPG instruction.

DCMPL
```
public static final Instruction DCMPL
```
DCMPL instruction.

DCMPG
```
public static final Instruction DCMPG
```
DCMPG instruction.

IRETURN

public static final ReturnInstruction IRETURN

IRETURN instruction.

LRETURN

public static final ReturnInstruction LRETURN

LRETURN instruction.

FRETURN

public static final ReturnInstruction FRETURN

FRETURN instruction.

DRETURN

public static final ReturnInstruction DRETURN

DRETURN instruction.

ARETURN

public static final ReturnInstruction ARETURN

ARETURN instruction.

RETURN

public static final ReturnInstruction RETURN

RETURN instruction.

ARRAYLENGTH

public static final Instruction ARRAYLENGTH

ARRAYLENGTH instruction.

ATHROW
```
public static final Instruction ATHROW
```
ATHROW instruction.

MONITORENTER

public static final Instruction MONITORENTER

MONITORENTER instruction.

MONITOREXIT

public static final Instruction MONITOREXIT

MONITOREXIT instruction.

THIS
```
public static final LocalVariableInstruction THIS
```
You can use these constants in multiple places safely, if you can guarantee that you will never alter their internal values, for example call setIndex(). THIS instruction (ALOAD_0)

ALOAD_0

public static final LocalVariableInstruction ALOAD_0

ALOAD_0 instruction (same as THIS).

ALOAD_1

public static final LocalVariableInstruction ALOAD_1

ALOAD_1 instruction.

ALOAD_2

public static final LocalVariableInstruction ALOAD_2

ALOAD_2 instruction.

ILOAD_0

public static final LocalVariableInstruction ILOAD_0

ILOAD_0 instruction.

ILOAD_1

public static final LocalVariableInstruction ILOAD_1

ILOAD_1 instruction.

ILOAD_2

public static final LocalVariableInstruction ILOAD_2

ILOAD_2 instruction.

ASTORE_0

public static final LocalVariableInstruction ASTORE_0

ASTORE_0 instruction.

ASTORE_1

public static final LocalVariableInstruction ASTORE_1

ASTORE_1 instruction.

ASTORE_2

public static final LocalVariableInstruction ASTORE_2

ASTORE_2 instruction.

ISTORE_0

public static final LocalVariableInstruction ISTORE_0

ISTORE_0 instruction.

ISTORE_1

public static final LocalVariableInstruction ISTORE_1

ISTORE_1 instruction.

ISTORE_2

public static final LocalVariableInstruction ISTORE_2

ISTORE_2 instruction.

INSTRUCTIONS
```
static final Instruction[] INSTRUCTIONS
```
Gets object via its opcode, for immutable instructions like branch instructions entries are set to null.

Constructor Detail
- InstructionConst
```
private InstructionConst()
```

Method Detail
- getInstruction
```
public static Instruction getInstruction(int index)
```
  Gets the Instruction.
  
  Parameters:
  
  index - the index, for example Const.RETURN.
  
  Returns:
  
  the entry from the private INSTRUCTIONS table.

Class InstructionConst