Java Foundation---Automatic type conversion in Java (vii)

Automatic type conversion in Java

In Java programs, it is often necessary to convert data between different basic data types. For example:

650) this.width=650; "src=" http://img.mukewang.com/5359d0c70001ffe202530066.jpg "/> in code int type variable Score1 can be directly for the double variable Score2 completion of the assignment operation, The result is: 650) this.width=650; src= http://img.mukewang.com/ 5359d10d0001d9c500540024.jpg "/> This conversion is called automatic type conversion .

Of course automatic type conversions are required to meet specific conditions :

1. The target type can be compatible with the source type, such as type double compatible int, but char type cannot be compatible with int

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2. The target type is greater than the source type, such as the double type is 8 bytes long, the int type is 4 bytes, so the double type of the variable can directly hold the int type of data, but the reverse is not possible

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Code:

public class helloworld{
public static void Main (string[] args) {
Double avg1=78.5;
int rise=5;
Double avg2=avg1+rise;
System.out.println ("Average test score:" +AVG1);
SYSTEM.OUT.PRINTLN ("Adjusted mean score:" +AVG2);
}
}

Operation Result:

Average Test score: 78.5
Adjusted average score: 83.5

1. Note The conditions for automatic type conversion Oh, theint type can be automatically converted to a double type, but the double type cannot be automatically converted to the INT type

2.5th line reference: Double avg2 = Avg1 + rise;

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Java Foundation---Automatic type conversion in Java (vii)