JVM指令
pop
Pop the top operand stack value 弹出 操作数 栈顶的值
astore_<n>
  Store reference into local variable  
aload_<n>
  Load reference from local variable
getstatic
  Get static field from class
ldc
Push item from run-time constant pool
athrow
Throw exception or error
areturn
  Return reference from method
                    
                
                
            
        
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