public class ClassA {

private int a;
private char x;


public ClassA () {
a=5;
x='c';
int local;
}


}


解决方案
此示例中声明了一个局部变量“local”。应避免这种情况。构造函数只能用于向字段分配值

public class ClassA {

private int a;
private char x;


public ClassA () {
a=5;
x='c';

}


}