请使用 NetBeans 打开考生文件夹下的项目 Java1_ ,完善 Java_1.java 文件,并进行调试,使程序输出结果如下: 具体程序如下: import javax.swing.JOptionPane; public class Java_1{ public static void main( String args[] ){ String s1, s2, s3, s4, output; s1 = new String( "hello" ); s2 = new String( "good bye" ); s3 = new String( "Happy Birthday" ); s4 = new String( "happy birthday" ); output = "s1 = " + s1 + "\ns2 = " + s2 + "\ns3 = " + s3 + "\ns4 = " + s4 + "\n\n"; // 测试字符串相等 if ( s1.equals( "hello" ) ) //*********Found********** output = output + " "; else output = output + "s1 does not equal \"hello\"\n"; // 用 == 测试相等 if ( s1 == "hello" ) output += "s1 equals \"hello\"\n"; else output += "s1 does not equal \"hello\"\n"; // 忽略字符格式测试相等 if ( s3.equalsIgnoreCase( s4 ) ) output += "s3 equals s4\n"; else output += "s3 does not equal s4\n"; // 内容比较 output += "\ns1.compareTo( s2 ) is " + s1.compareTo( s2 ) + "\ns2.compareTo( s1 ) is " + s2.compareTo( s1 ) + "\ns1.compareTo( s1 ) is " + s1.compareTo( s1 ) + "\ns3.compareTo( s4 ) is " + s3.compareTo( s4 ) + "\ns4.compareTo( s3 ) is " + s4.compareTo( s3 ) + "\n\n"; // 测试包含字符格式的域匹配 if ( s3.regionMatches( 0, s4, 0, 5 ) ) output += "First 5 characters of s3 and s4 match\n"; else output += "First 5 characters of s3 and s4 do not match\n"; // 忽略字符格式的域匹配 if ( s3.regionMatches( true, 0, s4, 0, 5 ) ) output += "First 5 characters of s3 and s4 match"; else output += "First 5 characters of s3 and s4 do not match"; //*********Found********** JOptionPane. ( null, output, " 字符串构造方法示例 ", JOptionPane.INFORMATION_MESSAGE ); System.exit( 0 ); } }