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public static void main(String[] args) { double d =12345678.12345678; System.out.printf("++++++输出%%%"+"null$"+".2"+"fd:"+" %1$.2f \n",d); output: ++++++输出% ull$.2fd: 12345678.12 -- Configuration Details -- Product: Eclipse IDE 4.10.0.20181214-0600 (org.eclipse.epp.package.jee.product)Installed Features: org.eclipse.jdt 3.16.0.v20181206-1038 Versioning Plugin: org.eclipse.platform 4.10.0.v20181206-0815