字符串习题

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public class Test{public static void main(String args[]){String s1 = "This is a dog";String s2 = s1;String s3 = "this is a dog";String s4 = "This is a dog";System.out.println("s1.equals(s2):" + s1.equals(s2));System.out.println("s1.compareTo(s2):" + s1.compareTo(s2));System.out.println("s1.equals(s4):" + s1.equals(s4));System.out.println("s1.compareTo(s4):" + s1.compareTo(s4));System.out.println("s1.equals(s3):" + s1.equals(s3));System.out.println("s1.compareTo(s3):" + s1.compareTo(s3));/*---------- 运行 ----------s1.equals(s2):trues1.compareTo(s2):0s1.equals(s4):trues1.compareTo(s4):0s1.equals(s3):falses1.compareTo(s3):-32输出完成 (耗时 0 秒) - 正常终止*/}}

public class Test{public static void main(String args[]){String s1 = "This ";String s2 = "is ";String s3 = "a ";String s4 = "String";String sConcat = s1.concat(s2).concat(s3).concat(s4);System.out.println(sConcat);/*---------- 运行 ----------This is a String输出完成 (耗时 0 秒) - 正常终止*/}}

public static void main(String args[]){String s1 = "This ";String s2 = "is ";String s3 = "a ";String s4 = "String";String sConcat = s1.concat(s2).concat(s3).concat(s4);String sCopy = String.copyValueOf(s1.toCharArray());System.out.println("concat:" + sConcat + "\ncopyValueOf:" + sCopy);/*---------- 运行 ----------concat:This is a StringcopyValueOf:This 输出完成 (耗时 0 秒) - 正常终止*/}

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