[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$f3VCGnj8h9GeaMyBCdtKFa1dwwS_jT_tND_7Aiz-ju84":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":10,"question":17,"related":18,"source":29,"type":108},[],"2024-05-16 19:36:07",144054284,[8,9],"正确","错误",{"count":11,"courseId":12,"courseImg":13,"courseName":14,"workId":15,"workName":16},86,"e668b186b2f02f38f3fb040bb4d5bf79","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Faeed7f4defad210f2933782a5f123643.png","JAVA程序设计","exam_122136437","专项练习:Java API","如果有一个String类型的变量str,初始值为"325",则想要将该字符串转换为一个整数并赋值给整型变量num,则执行"int num=Integer.parseInt(str);"语句即可",[19,31,40,49,58,67,73,81,90,99],{"answer":20,"createTime":21,"id":22,"options":23,"question":28,"source":29,"type":30},[],"2024-05-16 19:36:06",144054216,[24,25,26,27],"[0,95]","[0.94)","[0.95)","(0.95)","创建一个Random类的对象r,则执行r.nextInt(95);语句,产生的随机数的取值范围是()","v1",0,{"answer":32,"createTime":21,"id":33,"options":34,"question":39,"source":29,"type":30},[],144054218,[35,36,37,38],"toLowerCase()","toUpperCase()","indexOf()","valueOf()","在java中,声明一个double型变量num,初值为5.6,现在想将num变量转换为字符串,应该使用什么方法",{"answer":41,"createTime":21,"id":42,"options":43,"question":48,"source":29,"type":30},[],144054219,[44,45,46,47],"int n=15","Int n=new Int(num)","int n=new int(num)","Integer n=new Integer(num)","现在有一个整型变量num,初始值为15,则想要将该num变量转换为引用数据类型对象,对象名为n,以下哪些代码是正确的",{"answer":50,"createTime":21,"id":51,"options":52,"question":57,"source":29,"type":30},[],144054220,[53,54,55,56],"每一个Java应用程序运行时都产生一个Runtime类实例","Runtime实例可以将应用程序和运行环境相结合","Runtime类中的方法是多例的","Runtime实例不需要创建,直接通过getRuntime()方法获取","下列对于Runtime的描述中,错误的是()",{"answer":59,"createTime":21,"id":60,"options":61,"question":66,"source":29,"type":30},[],144054221,[62,63,64,65],"length()","lastIndexOf()","charAt()","endsWith()","程序中,判断一个字符串是否以指定子字符串结尾的方法是()",{"answer":68,"createTime":21,"id":69,"options":70,"question":72,"source":29,"type":30},[],144054222,[37,35,64,71],"toCharArray()","在java中,操作字符串时,以下哪个方法可以将字符串转换为字符数组",{"answer":74,"createTime":21,"id":75,"options":76,"question":80,"source":29,"type":30},[],144054223,[77,65,78,79],"startsWith()","contains()","isEmpty()","在一个字符串中,判断该字符串是否包含指定的字符串,可以使用()方法",{"answer":82,"createTime":21,"id":83,"options":84,"question":89,"source":29,"type":30},[],144054224,[85,86,87,88],"replace(" ","")","replace("cn","com")","replace(""," ")","replace("com","cn")","有一个字符串变量str,初始值为hbsi.com,现在想将该字符串变为hbsi.cn,则以下哪条语句是正确的",{"answer":91,"createTime":21,"id":92,"options":93,"question":98,"source":29,"type":30},[],144054225,[94,95,96,97],"rt.exe("notepad.exe")","rt.exe("mspaint.exe")","rt.exec("notepad.exe")","rt.exec("mspaint.exe")","现在有一个Runtime类的对象rt,想要通过代码打开Windows操作系统自带的画图工具,以下哪个代码是正确的",{"answer":100,"createTime":21,"id":101,"options":102,"question":107,"source":29,"type":30},[],144054226,[103,104,105,106],"sb.setCharAt(2,"n")","sb.CharAt(2,'n')","sb.setCharAt(3,'n')","sb.setCharAt(2,'n')","创建了一个StringBuffer对象sb并赋了初值,初始值为abcdpou,则想要将第3个字符内容修改为n,以下选项正确的是()",3]