此外，表达式在分配时必须与变量数据类型兼容。
Also, the expression must be assignment-compatible to the variable data type.
表达式测试两个对象引用变量与各数据类型的类型兼容性。
Expressions to test the type compatibility of two object reference variables with various data types.
表达式测试两个对象引用变量与各数据类型的类型兼容性。
Expressions to test the type compatibility of two object reference variables with various data types.
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