运算符总结 下面这个例子向大家展示了如何随同特定的运算符使用主数据类型。从根本上说，它是同一个例子反反复复地执行，只是使用了不同的主数据类型。文件编译时不会报错，因为那些会导致错误的行已用//!变成了注释内容。 //: AllOps.java // Tests all the Operators on all the // PRimitive data types to show which // ones are accepted by the Java compiler.
class AllOps { // To accept the results of a boolean test: void f(boolean b) {} void boolTest(boolean x, boolean y) { // Arithmetic operators: //! x = x * y; //! x = x / y; //! x = x % y; //! x = x + y; //! x = x - y; //! x++; //! x--; //! x = +y; //! x = -y; // Relational and logical: //! f(x > y); //! f(x >= y); //! f(x < y); //! f(x < = y); f(x == y); f(x != y); f(!y); x = x && y; x = x y; // Bitwise operators: //! x = ~y; x = x & y; x = x y; x = x ^ y; //! x = x < < 1; //! x = x >> 1; //! x = x >>> 1; // Compound assignment: //! x += y; //! x -= y; //! x *= y; //! x /= y; //! x %= y; //! x < < = 1; //! x >>= 1; //! x >>>= 1; x &= y; x ^= y; x = y; // Casting: //! char c = (char)x; //! byte B = (byte)x; //! short s = (short)x; //! int i = (int)x; //! long l = (long)x; //! float f = (float)x; //! double d = (double)x; } void charTest(char x, char y) { // Arithmetic operators: x = (char)(x * y); x = (char)(x / y); x = (char)(x % y); x = (char)(x + y); x = (char)(x - y); x++; x--; x = (char)+y; x = (char)-y; // Relational and logical: f(x > y); f(x >= y); f(x < y); f(x < = y); f(x == y); f(x != y); //! f(!x); //! f(x && y); //! f(x y); // Bitwise operators: x= (char)~y; x = (char)(x & y); x = (char)(x y); x = (char)(x ^ y); x = (char)(x < < 1); x = (char)(x >> 1); x = (char)(x >>> 1); // Compound assignment: x += y; x -= y; x *= y; x /= y; x %= y; x < < = 1; x >>= 1; x >>>= 1; x &= y; x ^= y; x = y; // Casting: //! boolean b = (boolean)x; byte B = (byte)x; short s = (short)x; int i = (int)x; long l = (long)x; float f = (float)x; double d = (double)x; } void byteTest(byte x, byte y) { // Arithmetic operators: x = (byte)(x* y); x = (byte)(x / y); x = (byte)(x % y); x = (byte)(x + y); x = (byte)(x - y); x++; x--; x = (byte)+ y; x = (byte)- y; // Relational and logical: f(x > y); f(x >= y); f(x < y); f(x < = y); f(x == y); f(x != y); //! f(!x); //! f(x && y); //! f(x y); // Bitwise operators: x = (byte)~y; x = (byte)(x & y); x = (byte)(x y); x = (byte)(x ^ y); x = (byte)(x < < 1); x = (byte)(x >> 1); x = (byte)(x >>> 1); // Compound assignment: x += y; x -= y; x *= y; x /= y; x %= y; x < < = 1; x >>= 1; x >>>= 1; x &= y; x ^= y; x = y; // Casting: //! boolean b = (boolean)x; char c = (char)x; short s = (short)x; int i = (int)x; long l = (long)x; float f = (float)x; double d = (double)x; } void shortTest(short x, short y) { // Arithmetic operators: x = (short)(x * y); x = (short)(x / y); x = (short)(x % y); x = (short)(x + y); x = (short)(x - y); x++; x--; x = (short)+y; x = (short)-y; // Relational and logical: f(x > y); f(x >= y); f(x < y); f(x < = y); f(x == y); f(x != y); //! f(!x); //! f(x && y); //! f(x y); // Bitwise operators: x = (short)~y; x = (short)(x & y); x = (short)(x y); x = (short)(x ^ y); x = (short)(x < < 1); x = (short)(x >> 1); x = (short)(x >>> 1); // Compound assignment: x += y; x -= y; x *= y; x /= y; x %= y; x < < = 1; x >>= 1; x >>>= 1; x &= y; x ^= y; x = y; // Casting: //! boolean b = (boolean)x; char c = (char)x; byte B = (byte)x; int i = (int)x; long l = (long)x; float f = (float)x; double d = (double)x; } void intTest(int x, int y) { // Arithmetic operators: x = x * y; x = x / y; x = x % y; x = x + y; x = x - y; x++; x--; x = +y; x = -y; // Relational and logical: f(x > y); f(x >= y); f(x < y); f(x < = y); f(x == y); f(x != y); //! f(!x); //! f(x && y); //! f(x y); // Bitwise operators: x = ~y; x = x & y; x = x y; x = x ^ y; x = x < < 1; x = x >> 1; x = x >>> 1; // Compound assignment: x += y; x -= y; x *= y; x /= y; x %= y; x < < = 1; x >>= 1; x >>>= 1; x &= y; x ^= y; x = y; // Casting: //! boolean b = (boolean)x; char c = (char)x; byte B = (byte)x; short s = (short)x; long l = (long)x; float f = (float)x; double d = (double)x; } void longTest(long x, long y) { // Arithmetic operators: x = x * y; x = x / y; x = x % y; x = x + y; x = x - y; x++; x--; x = +y; x = -y; // Relational and logical: f(x > y); f(x >= y); f(x < y); f(x < = y); f(x == y); f(x != y); //! f(!x); //! f(x && y); //! f(x y); // Bitwise operators: x = ~y; x = x & y; x = x y; x = x ^ y; x = x < < 1; x = x >> 1; x = x >>> 1; // Compound assignment: x += y; x -= y; x *= y; x /= y; x %= y; x < < = 1; x >>= 1; x >>>= 1; x &= y; x ^= y; x = y; // Casting: //!
