Java复习重点!!

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1、1、写结果classStringTest1{publicstaticvoidmain(String[]args){Strings1="hello";Strings2=newString("hello");if(s1.equals(s2)){System.out.println("相等");}else{System.out.println("不相等");}}}或者publicclassIfTest{publicstaticvoidmain(Stringargs[]){intx=3;inty=1;if(x=y)System.out.println("Not

2、equal");elseSystem.out.println("Equal");}}2、写结果publicclassTestArray{publicstaticvoidmain(Stringargs[]){inti,j;inta[]={5,9,6,8,7};for(i=0;i

3、i]+"");System.out.println();}3、写出以下程序的功能。importjava.io.*;publicclassTestFile{publicstaticvoidmain(Stringargs[])throwsException{BufferedReaderbr=newBufferedReader(newInputStreamReader(System.in));BufferedWriterbw=newBufferedWriter(newFileWriter(“input.txt"));Strings;while(true){S

4、ystem.out.print("请输入一个字符串：");System.out.flush();s=br.readLine();if(s.length()==0)break;bw.write(s);bw.newLine();}bw.close();}}4、写出结果classAnimal{Animal(){System.out.print("Animal");}}publicclassDogextendsAnimal{Dog(){System.out.print("Dog");}publicstaticvoidmain(String[]args){Dog

5、snoppy=newDog();}}5、5下面程序是实现采用JDBC-ODBC的数据库连接，连接数据数据源table1，并实现查询功能，请在适当的位置填写语句。classConn{StringsDBDriver="_________________________";StringsConnStr="jdbc:odbc:table1";Connectionconnect=null;ResultSetrs=null;publicConn(){try{_______________(sDBDriver);}catch(java.lang.ClassNotFo

6、undExceptione){System.err.println(e.getMessage());}}publicResultSetexecuteQuery(Stringsql){try{connect=DriverManager.getConnection(sConnStr);Statementstmt=connect.createStatement();rs=stmt.executeQuery(sql);}catch(SQLExceptionex){System.err.println(ex.getMessage());}returnrs;}}1

7、.阅读下面的程序,分析程序输出的结果.classLeaf{5inti=0;Leaf(inti){this.i=i;}Leafincreament(){i++;returnthis;}voidprint(){System.out.println("i="+i);}publicstaticvoidmain(String[]args){Leafleaf=newLeaf(100);leaf.increament().increament().print();}}i=1022.classStaticTest{staticintx=1;inty;StaticTes

8、t(){y++;}publicstaticvoidmain(Stringargs[]){Sta