How to get Array?

I'm having a JSON like below
`
{
        "String1":"Hello",
        "Array1":[
                [0.1, 0.2, 0.3],
                [0.4, 0.5, 0.6],
                [0.7, 0.8, 0.9]
        ],
        "Array2":[
                [0.7, 0.8, 0.9],
                [0.1, 0.2, 0.3],
                [0.4, 0.5, 0.6]
        ]
}
`
How do I get Array1 & Array2 out of this JSON and store it?