..., value
...reference is null
| ifnull | |
| branchbyte1 | |
| branchbyte2 |
Description
The value must of type reference. It is popped from the operand stack. If value is null, the unsigned branchbyte1 and branchbyte2 are used to construct a signed 16-bit offset, where the offset is calculated to be (branchbyte1 << 8) | branchbyte2. Execution then proceeds at that offset from the address of the opcode of this ifnull instruction. The target address must be that of an opcode of an instruction within the method that contains this ifnull instruction.
Otherwise, execution proceeds at the address of the instruction following this ifnull instruction.
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Java Virtual Machine Specification (HTML generated by dkramer on February 25, 1997)
Copyright © 1996 Sun Microsystems, Inc.
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