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数据对象如何定义为Java代码示例

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想将数据保存为这样子:

[{
		"subject": {
			"code": "B123",
			"words": [{
				"key": "gjc1",
				"wight": 9.8,
				"ct": 1575126920
			}, {
				"key": "gjc1",
				"wight": 9.8,
				"ct": 1575126920
			}, {
				"key": "gjc1",
				"wight": 9.8,
				"ct": 1575126920
			}],
			"wight": 3,
			"ct": 1575126920
		}
	}, {
		"subject": {
			"code": "C456",
			"words": [{
				"key": "gjc1",
				"wight": 9.8,
				"ct": 1575126920
			}, {
				"key": "gjc1",
				"wight": 9.8,
				"ct": 1575126920
			}, {
				"key": "gjc1",
				"wight": 9.8,
				"ct": 1575126920
			}],
			"wight": 3,
			"ct": 1575126920
		}
	}

]
[{
		"subject": {
			"code": "



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