Java软件中级工程师笔试题-复杂逻辑

J2EE部分packagetest;publicclassTest{publicstaticvoidmain(String[]args){精品文档放心下载intk=0;intret=++k+k+++++k+k;感谢阅读//ret的值为多少System.err.println(ret);}}packagetest;publicclassTest{publicstaticvoidmain(String[]args){感谢阅读inti1=10,i2=10;System.err.println("i1+i2="+i1+i2);感谢阅读System.err.println("i1-i2="+i1-i2);精品文档放心下载System.err.println("i1*i2="+i1*i2);谢谢阅读System.err.println("i1/i2="+i1/i2);精品文档放心下载}}packagetest;publicclassTest{publicvoidmyMethod(Stringstr){精品文档放心下载System.err.println("string");谢谢阅读}publicvoidmyMethod(Objectobj){精品文档放心下载System.err.println("object");谢谢阅读}publicstaticvoidmain(String[]args){谢谢阅读Testt=newTest();t.myMethod(null);}}..packagetest;importjava.util.Date;publicclassTest{publicstaticvoidmain(String[]args){感谢阅读Datedate=newDate();System.err.println(date.getMonth()+""+date.getDate());谢谢阅读}}packagetest;publicclassTest{publicstaticvoidmain(String[]args){感谢阅读doubleval=11.5;System.err.println(Math.round(val));谢谢阅读System.err.println(Math.floor(val));感谢阅读System.err.println(Math.ceil(val));精品文档放心下载}}packagetest;publicclassTestextendsBase{精品文档放心下载publicstaticvoidmain(String[]args){谢谢阅读Baseb=newTest();b.method();Testt=newTest();t.method();}@Overridepublicvoidmethod(){System.err.println("test");谢谢阅读}}classBase{publicvoidmethod()throwsInterruptedException{精品文档放心下载System.err.println("base");谢谢阅读}}..packagetest;publicclassTestextendsBase{感谢阅读publicstaticvoidmain(String[]args){感谢阅读newTest().method();}publicvoidmethod(){System.err.println(super.getClass().getName());精品文档放心下载System.err.println(this.getClass().getSuperclass().getName());感谢阅读}}classBase{}？packagetest;publicclassTest{publicstaticvoidmain(String[]args){谢谢阅读Stringstr1=newString("abc");精品文档放心下载Stringstr2=newString("abc");感谢阅读System.err.println(str1.equals(str2));感谢阅读StringBuffersb1=newStringBuffer("abc");感谢阅读StringBuffersb2=newStringBuffer("abc");精品文档放心下载System.err.println(sb1.equals(sb2));精品文档放心下载}}packagetest;publicclassTest{publicstaticvoidmain(String[]args){感谢阅读System.err.println(newTest().method1());谢谢阅读System.err.println(newTest().method2());谢谢阅读}publicintmethod1(){intx=1;try{returnx;}finally{++x;}}publicintmethod2(){..intx=1;try{returnx;}finally{return++x;}}}packagetest;publicclassTest{publicstaticvoidmain(String[]args){谢谢阅读System.err.println(method());精品文档放心下载}publicstaticbooleanmethod(){谢谢阅读try{returntrue;}finally{returnfalse;}}}和packagetest;publicclassTest{publicstaticvoidmain(String[]args){感谢阅读}publicsynchronizedvoidm1(){感谢阅读}publicstaticsynchronizedvoidm2(){谢谢阅读}}..packagetest;publicclassTest{publicstaticvoidmain(String[]args){精品文档放心下载Integeri1=127;Integeri2=127;System.err.println(i1==i2);精品文档放心下载i1=128;i2=128;System.err.println(i1==i2);精品文档放心下载}}packagetest;publicclassTest{publicstaticvoidmain(String[]args){谢谢阅读Stringstr1="a";Stringstr2="a";Stringstr3=newString("a");感谢阅读System.err.println(str1==str2);感谢阅读System.err.println(str1==str3);感谢阅读str3=/r/ern();System.err.println(str1==str3);感谢阅读}}packagetest;publicclassTest{publicstaticvoidmain(String[]args){精品文档放心下载System.err.println(12-11.9==0.1);精品文档放心下载}}..packagetest;importjava.math.BigInteger;谢谢阅读publicclassTest{publicstaticvoidmain(String[]args){精品文档放心下载BigIntegerone=newBigInteger("1");感谢阅读BigIntegertwo=newBigInteger("2");精品文档放心下载BigIntegerthree=newBigInteger("3");谢谢阅读BigIntegersum=newBigInteger("0");感谢阅读sum.add(one);sum.add(two);sum.add(three);System.out.println(sum.toString());精品文档放心下载}}感谢阅读packagetest;importjava.util.HashSet;importjava.util.Iterator;感谢阅读importjava.util.Set;publicclassTest{publicstaticvoidmain(String[]args){谢谢阅读Set<String>set=newHashSet<String>();精品文档放心下载set.add("one");set.add("two");set.add("three");set.add("four");set.add("five");for(Iterator<String>it=set.iterator();it.hasNext();){谢谢阅读System.err.println(it.next());精品文档放心下载}}}..publicclassTest{publicstaticvoidmain(String[]args){谢谢阅读System.err.println(args.length);精品文档放心下载}}A.nullB.0C.TestD.Exceptioninthread"main"java.lang.NullPointerException精品文档放心下载感谢阅读publicclassTest{publicTestinstance=null;谢谢阅读publicstaticTestgetInstance(){谢谢阅读if(instance==null){instance=newTest();returninstance;}}}谢谢阅读谢谢阅读..、、8i1+i2=1010语法错误i1*i2=100i1/i2=1、、string519、、12test11.0test12.0、、test.Testtruetest.Basefalse、、1A:synchronized是某个类的范围，感谢阅读2synchronizedstaticcSync{}防止多个线程同感谢阅读false时访问这个类中的synchronizedstatic方谢谢阅读法。它可以对类的所有对象实例起作用。B:synchronized是某实例的范围，synchronized防止多个线程同时谢谢阅读访问这个实例中的synchronized方法。、、truetruefalsefalsetrue、、false0、、twoBfiveonethreefour、getInstance无默认返回值instance必须是static、packagetest;importjava.io.File;publicclassTest{publicstaticvoidmain(String[]args){感谢阅读..newTest().read("D:/test","");感谢阅读}publicvoidread(Stringpath,Stringtab){感谢阅读Filefile=newFile(path);感谢阅读File[]childFiles=file.listFiles();精品文档放心下载for(inti=0;childFiles!=null&&i<childFiles.length;i++){谢谢阅读System.err.println(tab+childFiles[i].getName());精品文档放心下载if(childFiles[i].isDirectory()){感谢阅读read(childFiles[i].getPath(),tab+"\t");精品文档放心下载}}}}、packagetest;importjava.util.Arrays;importjava.util.Comparator;感谢阅读importjava.util.Scanner;publicclassTest{publicstaticvoidmain(String[]args){谢谢阅读Scannerin=newScanner(System.in);感谢阅读//注意这里的数组，不是int的Integer[]arr=newInteger[10];感谢阅读for(inti=0;i<10;i++){精品文档放心下载arr[i]=in.nextInt();}Arrays.sort(arr,newComparator<Integer>(){谢谢阅读@Overridepublicintcompare(Integero1,Integero2){谢谢阅读if(o1/r/