java 字符串区分大小写吗

java 字符串区分大小写吗

public class StringAPIDemo11{
public static void main(String args[]){
String str1 = "HELLO" ; // 定义源字符2113串
String str2 = "hello" ; // 定义字符串
System.out.println("\"HELLO\" equals \"hello\" " + str1.equals(str2)) ;
System.out.println("\"HELLO\" equalsIgnoreCase \"hello\" "
+ str1.equalsIgnoreCase(str2)) ; // 不区5261分大小写4102的1653比较
}
};

import java.awt.button; import java.awt.frame; import java.awt.label; import java.awt.textfield; import java.awt.event.actionevent; import java.awt.event.actionlistener; import java.awt.event.windowadapter; import java.awt.event.windowevent; public class x2 extends windowadapter implements actionlistener { frame f; label l1,l2,l3,l4,l5; textfield t1,t2,t3,t4; button b; public static void main(string args[]) { x2 be=new x2(); be.go(); } public void go() { f=new frame("form1"); f.setlayout(null); l1=new label("字符串处理程序"); f.add(l1); l1.setbounds(250,60,150,50); l2=new label("请输入要处理的字符串:"); f.add(l2); l2.setbounds(50,150,150,20); l3=new label("长度为:"); f.add(l3); l3.setbounds(50,250,150,20); l4=new label("小写形式为:"); f.add(l4); l4.setbounds(50,300,150,20); l5=new label("其大些形式为"); f.add(l5); l5.setbounds(50,350,150,20); t1=new textfield("",5); f.add(t1); t1.setbounds(210,150,180,20); t2=new textfield("",5); f.add(t2); t2.setbounds(210,250,100,20); t3=new textfield("",5); f.add(t3); t3.setbounds(210,300,180,20); t4=new textfield("",5); f.add(t4); t4.setbounds(210,350,180,20); b=new button("处理"); b.addactionlistener(this); f.add(b); b.setbounds(50,190,70,35); f.addwindowlistener(this); f.setsize(700,500); f.setvisible(true); } public void actionperformed(actionevent e) { t2.settext(t1.gettext().length()+""); char[] c=t1.gettext().tochararray(); if(c.length<=0) return; for(int i=0;i if(c[i]>='a'&&c[i]<='z') c[i]=(char) (c[i]-'a'+'a'); } t3.settext(new string(c)); for(int i=0;i c[i]=(char) (c[i]-'a'+'a'); } t4.settext(new string(c)); } public void windowclosing(windowevent e) { system.exit(0); } }

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