astore : store object reference in local variable : index : visitInsn()

Description

Pops objectref (a reference to an object or array) off the stack and stores it in local variable <varnum>. The astore instruction takes a single parameter, <varnum>, an unsigned integer which indicates which local variable is used. <varnum> must be a valid local variable number in the current frame.

Example

aload 1    ; Push object reference in local variable 1 onto stack
astore 3	; and store it in local variable 3

Notes

astore can also be used to store a returnAddress in a local variable. See the jsr instruction for more details.

See also

lstore istore dstore fstore wide

Stack

Before	After
objectref	...
...	...

Bytecode

Type	Description
u1	astore opcode = 0x3A (58)
u1	<varnum>

There is also a wide format for this instruction, which supports access to all local variables from 0 to 65535:

Type	Description
u1	wide opcode = 0xC4 (196)
u1	astore opcode = 0x3A (58)
u2	<varnum>