Based on Bill Verners' Inside the Java Virtual Machine, McGraw Hill Companies, 1997

new - Create a new object

opcode:  187 (0xbb)   usage: new class   stack before: ... stack after: ..., objectref   description: This instruction creates a new object of the given class descriptor.

newarray - Allocate new array of primitive type components

opcode:  188 (0xbc)   usage: newarray type   stack before: ..., count stack after: arrayref   description: This instruction pushes on stack a reference to a new array of primitive type components and size count.

nop - Do nothing

opcode:  0 (0x0)   usage: nop   stack: No change   description: This instruction does nothing ;)