Java Data type conversions

Grammar:
A. Automatic type conversion: Under certain conditions, the system auto-complete type conversion is also called the implicit conversion (implicit casting)
A. Two types of compatibility
B. Destination type is greater than source type
C. For an expression, if one operand is of type double, the entire expression can be promoted to type double

B. Coercion type conversion (Explicit Casting): Under certain conditions, the programmer manually completes the type conversion
A. Two types of compatibility
B. Generic target type small fish source type
IMPORTANT: 1. Forcing type conversions will lose precision

Example: 1. Automatic type conversion:
int i = 10;
Double d = i;
2. Force type conversions:
Double d = 10.0;
int i = (int) d;

Example code:

1  PackageCom.sanlianxueuan;2 3  Public classDemo03 {4 5     /**6 * Conversion of data types7      */8      Public Static voidMain (string[] args) {9         //Automatic type conversion (implicit conversion)Ten         byteNUM1 = 10; One         intnum2 =NUM1; A System.out.println (num2); -         LongNUM3 =num2; - System.out.println (num3); the          -         floatf = 10.5f; -         DoubleD =F; - System.out.println (d); +          -         intNUM4 = 100; +         floatNUM5 =num4; A System.out.println (NUM5); at          -         CharC1= ' a '; -         intNUM6 = C1;//character assigned value to shaping variable - System.out.println (NUM6); -System.out.println (c1+10); -System.out.println ((Char) (c1+10)); in          -          to         //Forcing type conversions (explicit conversions) +         intNUM7 = 10; -          ShortNUM8 = ( Short) Num7; the System.out.println (NUM8); *          $         floatNUM9 = (float) 10.25;Panax Notoginseng System.out.println (NUM9); -          the         intNUM10 = 65; +         CharNUM11 = (Char) NUM10; A System.out.println (NUM11); the          +         intNUM12 = 10; -         DoubleNum13 =10.6; $         floatres = (float) (num12+num13); $ System.out.println (res); -          -         /*Summary: Byte<short (char) <int<long<float<double*/ the          -     }Wuyi  the}

Java Data type conversions