没有问题。 如a = "a"; b = "b"; c = "c"; a = b + c; 则a = "bc"; a += b; 则a = "ab";
没有什么异常但一般不这样操作字符串,一般使用StringBuffer(); class test { public static void main(String[] args) { String a = "a"; String b = "b"; String c = "c"; a = b+c; System.out.println(a); a += b; System.out.println(a); } }
如a = "a"; b = "b"; c = "c";
a = b + c; 则a = "bc";
a += b; 则a = "ab";
class test
{
public static void main(String[] args)
{
String a = "a";
String b = "b";
String c = "c";
a = b+c;
System.out.println(a);
a += b;
System.out.println(a);
}
}