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class Example5_1
{
public static void main(String args[])
{
String s1,s2;
s1=new String("we are students");
s2=new String("we are students");
System.out.println(s1.equals(s2)); //Êä³ö½á¹ûÊÇ£ºtrue¡£
System.out.println(s1==s2); //Êä³ö½á¹ûÊÇ£ºfalse
String s3,s4;
s3="how are you";
s4="how are you";
System.out.println(s3.equals(s4)); //Êä³ö½á¹ûÊÇ£ºtrue¡£
System.out.println(s3==s4); //Êä³ö½á¹ûÊÇ£ºtrue¡£
}
}
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S= “hello”ºÍs= new String£¨“hello”£©£ºS= “hello”£¬Ö±½ÓÖ¸Ïò“hello”µÄµØÖ· s=new String£¨“hello”£©£¬Ö±
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public class P {
public static void main(String[] args){
String pattern="000";
java.text.DecimalFormat df = new java.text.DecimalFormat(pattern);
int i = 10,j=6;
System.out.println("i="+df.format(i)+"\nj="+df.format(j));
}
}
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i=010 ......

java IO learning

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