关于字符串连接操作符（三）(源自IBM蓝色之路一道笔试题目)

ybaidukuai

再看下下面的例子

public class TestChar1 {   
public static void main(String[] args) {  
// int类型的常量可以赋值给任意类型的变量
byte b = (int) 1;   //OK
short s = (int) 1;  //OK
int i = (int) 1;    //OK
long l = (int) 1;   //OK
float f = (int) 1;  //OK
double d = (int) 1; //OK  
char c = (int) 1;   //OK
}   
}
public class TestChar2 {   
public static void main(String[] args) {  
// int类型的变量只能赋值给高类型的变量，不能赋值给低类型的变量（会损失精度）        
int a = 1;
char c = (int) a;
// Type mismatch: cannot convert from int to char      
byte b = (int) a;
// Type mismatch: cannot convert from int to char
short s = (int) a;   
// Type mismatch: cannot convert from int to char
int i = (int) a;   //OK
long l = (int) a;  //OK
float f = (int) a; //OK  
double d = (int) a;//OK   
}   
}
public class TestChar3 {   
public static void main(String [] args) {   
int i = 1;   
// Type mismatch: cannot convert from int to char
char c = i;   
System.out.println(c);   
}   
}
public class TestChar4 {   
public static void main(String [] args) {   
char c = (int)1; //Ok, 等价于： char c='\001';  
char d = '\001'; //OK
System.out.println(c==d); //output: true    }   
}