iconst_m1 : push the integer constant -1 : index : visitInsn()

Description

This instruction pushes the int -1 onto the operand stack.

Notes

You could also use bipush -1, sipush -1 or ldc -1 to achieve the same effect, although iconst_m1 is typically more efficient and uses fewer bytes in the bytecode.

See also

bipush sipush ldc ldc_w ldc2_w aconst_null iconst_n lconst_l fconst_f dconst_d

Stack

Before	After
...	-1
	...

Bytecode

Type	Description
u1	iconst_m1 opcode = 0x02 (2)