java错误Constructor call must be the first statement in a constructor怎么翻译?

java错误Constructor call must be the first statement in a constructor怎么翻译? 大哥大姐们求助Android java.lang.InstantiationException:can't instantiate class com.lau.vlcdemo.VideoPlayerActivity; no empty constructor associate constructor是什么意思 请教一个关于java的英文题目.“1.Which of the following stat”1.Which of the following statements is true about constructors?a) A constructor must be listed straight after the fields.b) A constructor must have no parameters.c) A class can java java 关于JAVA t中try-catch的用法?一个try-catch块 是不是只能 捕获一个错误呀?多重的try-catch(一个try中有N个catch)是能捕获多种错误还是捕获多个错误?具体说一下,书上都把我弄晕了 ,了还有嵌套的try-ca 发生错误 java.lang.NumberFormatException:nullat java.lang.Integer.parseInt(Integer.java:436)at java.lang.Integer.parseInt(Integer.java:518)at com.palic.sales.life.pos.web.util.PosTypeResourceViewResolver.resolveViewName(PosTypeResourceViewResolve java.lang.ArithmeticException: / by zeroat java.math.BigDecimal.divi谁知道这个错误?java.lang.ArithmeticException: / by zero at java.math.BigDecimal.divide(BigDecimal.java:1327) at com.picc.scms.inf.service.spring.MyCommissionDeta java.lang.NullPointerException错误是什么意思安卓APP的错误提示是java.lang.NullPointerException,这是一个什么错误呢?更多信息见图.谢谢java.lang.NullPointerException at goldendawn.getimei.ui.MainActivity$13.onClick(MainAct 在java中,下面选项中关于java.lang.Object 类的说法错误的是( )在java中,下面选项中关于java.lang.Object 类的说法错误的是( )A、在java中,所有的JAVA类都直接继承了Object 类B、假定在定义一个类时,没有 编java代码求椭圆和长方形的面积和周长.要求：写两个class：ellipse 和 rectangle,含有以下的state variables：a location point（x,y）,a height h and a width w.每个class里面的要求：1.至少一个constructor method 2. java这个程序为什么会等于0class B {private int num = 10;public void draw(){System.out.println(B.draw(),num+num);}public B(){System.out.println(B constructor);draw();}}class A extends B{/*** @param args*/private int num = 1;public void dr java空白final的问题class Final{Final(){System.out.println(Final constructor);}}public class FinalTest{private final int a;private final Final f;public FinalTest(int i){a=i;System.out.println(a);}public FinalTest(Final f){this.f=f;}public stati 错误：java.lang.IllegalStateException:Zip File is closed运行错误如下：at org.apache.poi.openxml4j.util.ZipFileZipEntrySource.getEntries(ZipFileZipEntrySource.java:45)at org.apache.poi.openxml4j.opc.ZipPackage.getPartsImpl(ZipPackage.java:16 java.lang.ClassCastException:android.widget.ExpandableListViewExpandableListContextMenuInfo求高手解答这是什么错误,怎么解决 java.lang.NullPointerException错误成绩单录入在下面的表单输入成绩：姓名英语 java.sql.SQLException: Listener refused the connection with the following error:这是什么错误啊