int i = 0;   
int j = i++;   
int k = --i;  

int i = 0;   
int j = i++ + ++i;   
int k = --i + i--;  

int i=0;   
System.out.println(i++);  

float f=0.1F;   
f++;   
double d=0.1D;   
d++;   
char c='a';   
c++;  

public class Test {   
    public static void main(String[] args) {   
        // 整型   
        byte b = 0;   
        b++;   
        // 整型   
        long l = 0;   
        l++;   
        // 浮点型   
        double d = 0.0;   
        d++;   
        // 字符串   
        char c = 'a';   
        c++;   
        // 基本类型包装器类   
        Integer i = new Integer(0);   
        i++;   
    }   
}  

public class BitOperatorTest {   
    public static void main(String[] args) {   
        // 整型   
        byte b1 = 10, b2 = 20;   
        System.out.println("(byte)10 & (byte)20 = " + (b1 & b2));   
        // 字符串型   
        char c1 = 'a', c2 = 'A';   
        System.out.println("(char)a | (char)A = " + (c1 | c2));   
        // 基本类型的包装器类   
        Long l1 = new Long(555), l2 = new Long(666);   
        System.out.println("(Long)555 ^ (Long)666 = " + (l1 ^ l2));   
        // 浮点型   
        float f1 = 0.8F, f2 = 0.5F;   
        // 编译报错，按位运算符不能用于浮点数类型   
        // System.out.println("(float)0.8 & (float)0.5 = " + (f1 & f2));   
    }   
}  

public class OperatorTest {   
    public boolean leftCondition() {   
        System.out.println("执行-返回值:false;方法:leftCondition()");   
        return false;   
    }   
  
    public boolean rightCondition() {   
        System.out.println("执行-返回值:true;方法:rightCondition()");   
        return true;   
    }   
  
    public int leftNumber() {   
        System.out.println("执行-返回值:0;方法:leftNumber()");   
        return 0;   
    }   
  
    public int rightNumber() {   
        System.out.println("执行-返回值:1;方法:rightNumber()");   
        return 1;   
    }   
  
    public static void main(String[] args) {   
        OperatorTest ot = new OperatorTest();   
  
        if (ot.leftCondition() && ot.rightCondition()) {   
            // do something   
        }   
        System.out.println();   
  
        int i = ot.leftNumber() & ot.rightNumber();   
    }   
}  

请用最有效率的方法计算出2乘以8等于几？

String ppName = (dualStackvoipUa.getPacketProcessor() != null) 
                ? dualStackvoipUa.getPacketProcessor().getName() : null;

           String ppName;
            if (dualStackvoipUa.getPacketProcessor() != null)
            {
                ppName = dualStackvoipUa.getPacketProcessor().getName();
            }
            else
            {
                ppName = null;
            }

newfish wrote:
// 基本类型的包装器类
Long l1 = new Long(555), l2 = new Long(666);
System.out.println("(Long)555 ^ (Long)666 = " + (l1 ^ l2));

这里不应该是用Long 而应该是用long吧
进行运算的应该是原始类型呀